121157220 has 48 divisors (see below), whose sum is σ = 339873408. Its totient is φ = 32248320.

The previous prime is 121157219. The next prime is 121157227. The reversal of 121157220 is 22751121.

It is not an unprimeable number, because it can be changed into a prime (121157227) 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, 37260 + ... + 40380.

It is an arithmetic number, because the mean of its divisors is an integer number (7080696).

Almost surely, 2^121157220 is an apocalyptic number.

121157220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121157220 is an abundant number, since it is smaller than the sum of its proper divisors (218716188).

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

121157220 is a wasteful number, since it uses less digits than its factorization.

121157220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780 (or 3778 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 121157220 is about 11007.1440437563. The cubic root of 121157220 is about 494.8228730609.

The spelling of 121157220 in words is "one hundred twenty-one million, one hundred fifty-seven thousand, two hundred twenty".