1212212220 has 48 divisors (see below), whose sum is σ = 3503689728. Its totient is φ = 312828480.

The previous prime is 1212212219. The next prime is 1212212233. The reversal of 1212212220 is 222122121.

1212212220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1212212220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324004 + ... + 327723.

It is an arithmetic number, because the mean of its divisors is an integer number (72993536).

Almost surely, 2^1212212220 is an apocalyptic number.

1212212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212212220 is an abundant number, since it is smaller than the sum of its proper divisors (2291477508).

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

1212212220 is a wasteful number, since it uses less digits than its factorization.

1212212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651770 (or 651768 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1212212220 is about 34816.8381677602. The cubic root of 1212212220 is about 1066.2512481735.

Adding to 1212212220 its reverse (222122121), we get a palindrome (1434334341).

Subtracting from 1212212220 its reverse (222122121), we obtain a palindrome (990090099).

It can be divided in two parts, 12122 and 12220, that added together give a palindrome (24342).

The spelling of 1212212220 in words is "one billion, two hundred twelve million, two hundred twelve thousand, two hundred twenty".