1212221000120 has 64 divisors (see below), whose sum is σ = 2966387084640. Its totient is φ = 443157696000.

The previous prime is 1212221000117. The next prime is 1212221000129. The reversal of 1212221000120 is 210001222121.

It is a junction number, because it is equal to n+sod(n) for n = 1212221000095 and 1212221000104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221000129) 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, 11488046 + ... + 11593085.

Almost surely, 2^{1212221000120} is an apocalyptic number.

1212221000120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212221000120 is an abundant number, since it is smaller than the sum of its proper divisors (1754166084520).

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

1212221000120 is a wasteful number, since it uses less digits than its factorization.

1212221000120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23081256 (or 23081252 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1212221000120 its reverse (210001222121), we get a palindrome (1422222222241).

The spelling of 1212221000120 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty", and thus it is an aban number.