121917628 has 12 divisors (see below), whose sum is σ = 243835312. Its totient is φ = 52250400.

The previous prime is 121917617. The next prime is 121917667. The reversal of 121917628 is 826719121.

121917628 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2177073 + ... + 2177128.

Almost surely, 2^121917628 is an apocalyptic number.

It is an amenable number.

121917628 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121917628 is a wasteful number, since it uses less digits than its factorization.

121917628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4354212 (or 4354210 counting only the distinct ones).

The product of its digits is 12096, while the sum is 37.

The square root of 121917628 is about 11041.6315823342. The cubic root of 121917628 is about 495.8559187383.

The spelling of 121917628 in words is "one hundred twenty-one million, nine hundred seventeen thousand, six hundred twenty-eight".