921225121 has 8 divisors (see below), whose sum is σ = 976440960. Its totient is φ = 866123328.

The previous prime is 921225113. The next prime is 921225133. The reversal of 921225121 is 121522129.

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 921225121 - 2³ = 921225113 is a prime.

It is a super-2 number, since 2×921225121² = 1697311447122929282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921225161) 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, 11581 + ... + 44458.

It is an arithmetic number, because the mean of its divisors is an integer number (122055120).

Almost surely, 2^921225121 is an apocalyptic number.

It is an amenable number.

921225121 is a deficient number, since it is larger than the sum of its proper divisors (55215839).

921225121 is a wasteful number, since it uses less digits than its factorization.

921225121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57023.

The product of its digits is 720, while the sum is 25.

The square root of 921225121 is about 30351.6905789447. The cubic root of 921225121 is about 973.0203517553.

The spelling of 921225121 in words is "nine hundred twenty-one million, two hundred twenty-five thousand, one hundred twenty-one".