122157621 has 12 divisors (see below), whose sum is σ = 178684480. Its totient is φ = 80407080.

The previous prime is 122157589. The next prime is 122157643. The reversal of 122157621 is 126751221.

122157621 is a `hidden beast` number, since 1 + 22 + 15 + 7 + 621 = 666.

It is not a de Polignac number, because 122157621 - 2⁵ = 122157589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122157521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85195 + ... + 86616.

Almost surely, 2^122157621 is an apocalyptic number.

It is an amenable number.

122157621 is a deficient number, since it is larger than the sum of its proper divisors (56526859).

122157621 is a wasteful number, since it uses less digits than its factorization.

122157621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171896 (or 171893 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 122157621 is about 11052.4938814731. The cubic root of 122157621 is about 496.1810670980.

The spelling of 122157621 in words is "one hundred twenty-two million, one hundred fifty-seven thousand, six hundred twenty-one".