2021639832 has 48 divisors (see below), whose sum is σ = 5713334640. Its totient is φ = 644580288.

The previous prime is 2021639821. The next prime is 2021639833. The reversal of 2021639832 is 2389361202.

2021639832 is a `hidden beast` number, since 20 + 216 + 398 + 32 = 666.

It is a super-2 number, since 2×2021639832² = 8174055220657976448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021639833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 608743 + ... + 612054.

It is an arithmetic number, because the mean of its divisors is an integer number (119027805).

Almost surely, 2^2021639832 is an apocalyptic number.

It is an amenable number.

2021639832 is an abundant number, since it is smaller than the sum of its proper divisors (3691694808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021639832 is a wasteful number, since it uses less digits than its factorization.

2021639832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220832 (or 1220825 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 2021639832 is about 44962.6492991683. The cubic root of 2021639832 is about 1264.4488388253.

The spelling of 2021639832 in words is "two billion, twenty-one million, six hundred thirty-nine thousand, eight hundred thirty-two".