1211201112220 has 96 divisors (see below), whose sum is σ = 2892620408832. Its totient is φ = 422008800000.

The previous prime is 1211201112217. The next prime is 1211201112223. The reversal of 1211201112220 is 222111021121.

It is an interprime number because it is at equal distance from previous prime (1211201112217) and next prime (1211201112223).

It is a junction number, because it is equal to n+sod(n) for n = 1211201112194 and 1211201112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211201112223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190366 + ... + 1568005.

It is an arithmetic number, because the mean of its divisors is an integer number (30131462592).

Almost surely, 2^{1211201112220} is an apocalyptic number.

1211201112220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211201112220 is an abundant number, since it is smaller than the sum of its proper divisors (1681419296612).

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

1211201112220 is a wasteful number, since it uses less digits than its factorization.

1211201112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758523 (or 1758521 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211201112220 its reverse (222111021121), we get a palindrome (1433312133341).

The spelling of 1211201112220 in words is "one trillion, two hundred eleven billion, two hundred one million, one hundred twelve thousand, two hundred twenty".