864053021 has 4 divisors (see below), whose sum is σ = 930518652. Its totient is φ = 797587392.

The previous prime is 864052997. The next prime is 864053059. The reversal of 864053021 is 120350468.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 167832025 + 696220996 = 12955^2 + 26386^2 .

It is a cyclic number.

It is not a de Polignac number, because 864053021 - 2¹⁴ = 864036637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864053621) 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, 33232796 + ... + 33232821.

It is an arithmetic number, because the mean of its divisors is an integer number (232629663).

Almost surely, 2^864053021 is an apocalyptic number.

It is an amenable number.

864053021 is a deficient number, since it is larger than the sum of its proper divisors (66465631).

864053021 is a wasteful number, since it uses less digits than its factorization.

864053021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66465630.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 864053021 is about 29394.7788050871. The cubic root of 864053021 is about 952.4601135581.

The spelling of 864053021 in words is "eight hundred sixty-four million, fifty-three thousand, twenty-one".