64318021 has 16 divisors (see below), whose sum is σ = 72394560. Its totient is φ = 56782080.

The previous prime is 64318003. The next prime is 64318031. The reversal of 64318021 is 12081346.

It is a cyclic number.

It is not a de Polignac number, because 64318021 - 2⁵ = 64317989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64318031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33631 + ... + 35491.

It is an arithmetic number, because the mean of its divisors is an integer number (4524660).

Almost surely, 2^64318021 is an apocalyptic number.

It is an amenable number.

64318021 is a deficient number, since it is larger than the sum of its proper divisors (8076539).

64318021 is a wasteful number, since it uses less digits than its factorization.

64318021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 64318021 is about 8019.8516819203. The cubic root of 64318021 is about 400.6614493590.

Adding to 64318021 its reverse (12081346), we get a palindrome (76399367).

The spelling of 64318021 in words is "sixty-four million, three hundred eighteen thousand, twenty-one".