121655600120 has 64 divisors (see below), whose sum is σ = 274627584000. Its totient is φ = 48502067328.

The previous prime is 121655600111. The next prime is 121655600123. The reversal of 121655600120 is 21006556121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121655600123) 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, 17279561 + ... + 17286599.

It is an arithmetic number, because the mean of its divisors is an integer number (4291056000).

Almost surely, 2^121655600120 is an apocalyptic number.

121655600120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121655600120 is an abundant number, since it is smaller than the sum of its proper divisors (152971983880).

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

121655600120 is a wasteful number, since it uses less digits than its factorization.

121655600120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8412 (or 8408 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 121655600120 in words is "one hundred twenty-one billion, six hundred fifty-five million, six hundred thousand, one hundred twenty".