121221021220120 has 64 divisors (see below), whose sum is σ = 280122180576480. Its totient is φ = 47177349405696.

The previous prime is 121221021220111. The next prime is 121221021220127. The reversal of 121221021220120 is 21022120122121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221021220127) 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, 136987327 + ... + 137869393.

Almost surely, 2^{121221021220120} is an apocalyptic number.

121221021220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221021220120 is an abundant number, since it is smaller than the sum of its proper divisors (158901159356360).

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

121221021220120 is a wasteful number, since it uses less digits than its factorization.

121221021220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974972 (or 974968 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121221021220120 its reverse (21022120122121), we get a palindrome (142243141342241).

The spelling of 121221021220120 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty thousand, one hundred twenty".