64038921 has 4 divisors (see below), whose sum is σ = 85385232. Its totient is φ = 42692612.

The previous prime is 64038913. The next prime is 64038929. The reversal of 64038921 is 12983046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (64038913) and next prime (64038929).

It is a cyclic number.

It is not a de Polignac number, because 64038921 - 2³ = 64038913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64038929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10673151 + ... + 10673156.

It is an arithmetic number, because the mean of its divisors is an integer number (21346308).

Almost surely, 2^64038921 is an apocalyptic number.

It is an amenable number.

64038921 is a deficient number, since it is larger than the sum of its proper divisors (21346311).

64038921 is a wasteful number, since it uses less digits than its factorization.

64038921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21346310.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 64038921 is about 8002.4321927774. The cubic root of 64038921 is about 400.0810689851.

The spelling of 64038921 in words is "sixty-four million, thirty-eight thousand, nine hundred twenty-one".