63331921 has 8 divisors (see below), whose sum is σ = 68292000. Its totient is φ = 58534560.

The previous prime is 63331913. The next prime is 63331927. The reversal of 63331921 is 12913336.

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 63331921 - 2³ = 63331913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63331921.

It is not an unprimeable number, because it can be changed into a prime (63331927) 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, 39871 + ... + 41428.

It is an arithmetic number, because the mean of its divisors is an integer number (8536500).

Almost surely, 2^63331921 is an apocalyptic number.

It is an amenable number.

63331921 is a deficient number, since it is larger than the sum of its proper divisors (4960079).

63331921 is a wasteful number, since it uses less digits than its factorization.

63331921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81359.

The product of its digits is 2916, while the sum is 28.

The square root of 63331921 is about 7958.1355228470. The cubic root of 63331921 is about 398.6032974816.

The spelling of 63331921 in words is "sixty-three million, three hundred thirty-one thousand, nine hundred twenty-one".