1221102212120 has 64 divisors (see below), whose sum is σ = 3305239084800. Its totient is φ = 396628686720.

The previous prime is 1221102212119. The next prime is 1221102212129. The reversal of 1221102212120 is 212122011221.

It is a super-2 number, since 2×1221102212120² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221102212129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114759926 + ... + 114770565.

It is an arithmetic number, because the mean of its divisors is an integer number (51644360700).

Almost surely, 2^{1221102212120} is an apocalyptic number.

1221102212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221102212120 is an abundant number, since it is smaller than the sum of its proper divisors (2084136872680).

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

1221102212120 is a wasteful number, since it uses less digits than its factorization.

1221102212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229530528 (or 229530524 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221102212120 its reverse (212122011221), we get a palindrome (1433224223341).

The spelling of 1221102212120 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred twelve thousand, one hundred twenty".