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1211002212220 = 22560550110611
BaseRepresentation
bin10001100111110101010…
…110110100111101111100
311021202210211022101210221
4101213311112310331330
5124320113031242340
62324154324111124
7153330522651343
oct21476526647574
94252724271727
101211002212220
114276461a5a69
1217684a2354a4
138a273b08258
1442881812b5a
152177aa6544a
hex119f55b4f7c

1211002212220 has 12 divisors (see below), whose sum is σ = 2543104645704. Its totient is φ = 484400884880.

The previous prime is 1211002212169. The next prime is 1211002212223. The reversal of 1211002212220 is 222122001121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1211002212194 and 1211002212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211002212223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30275055286 + ... + 30275055325.

It is an arithmetic number, because the mean of its divisors is an integer number (211925387142).

Almost surely, 21211002212220 is an apocalyptic number.

1211002212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211002212220 is an abundant number, since it is smaller than the sum of its proper divisors (1332102433484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211002212220 is a wasteful number, since it uses less digits than its factorization.

1211002212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60550110620 (or 60550110618 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1211002212220 its reverse (222122001121), we get a palindrome (1433124213341).

The spelling of 1211002212220 in words is "one trillion, two hundred eleven billion, two million, two hundred twelve thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 60550110611 121100221222 242200442444 302750553055 605501106110 1211002212220