121625021 has 8 divisors (see below), whose sum is σ = 147176640. Its totient is φ = 98117568.

The previous prime is 121625017. The next prime is 121625047. The reversal of 121625021 is 120526121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121625021 - 2² = 121625017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121624984 and 121625002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121625051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510911 + ... + 511148.

It is an arithmetic number, because the mean of its divisors is an integer number (18397080).

Almost surely, 2^121625021 is an apocalyptic number.

It is an amenable number.

121625021 is a deficient number, since it is larger than the sum of its proper divisors (25551619).

121625021 is a wasteful number, since it uses less digits than its factorization.

121625021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022083.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 121625021 is about 11028.3734521461. The cubic root of 121625021 is about 495.4589098595.

The spelling of 121625021 in words is "one hundred twenty-one million, six hundred twenty-five thousand, twenty-one".