802581021 has 64 divisors (see below), whose sum is σ = 1366087680. Its totient is φ = 464785200.

The previous prime is 802581001. The next prime is 802581029. The reversal of 802581021 is 120185208.

802581021 is a `hidden beast` number, since 80 + 2 + 581 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 802581021 - 2⁷ = 802580893 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (802581029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 826066 + ... + 827036.

It is an arithmetic number, because the mean of its divisors is an integer number (21345120).

Almost surely, 2^802581021 is an apocalyptic number.

It is an amenable number.

802581021 is a deficient number, since it is larger than the sum of its proper divisors (563506659).

802581021 is a wasteful number, since it uses less digits than its factorization.

802581021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036 (or 1008 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 802581021 is about 28329.8609421225. The cubic root of 802581021 is about 929.3150315274.

The spelling of 802581021 in words is "eight hundred two million, five hundred eighty-one thousand, twenty-one".