2021157180 has 72 divisors (see below), whose sum is σ = 7006682592. Its totient is φ = 461978496.

The previous prime is 2021157139. The next prime is 2021157191. The reversal of 2021157180 is 817511202.

2021157180 is a `hidden beast` number, since 2 + 0 + 2 + 11 + 571 + 80 = 666.

2021157180 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 800787 + ... + 803306.

It is an arithmetic number, because the mean of its divisors is an integer number (97315036).

Almost surely, 2^2021157180 is an apocalyptic number.

2021157180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021157180 is an abundant number, since it is smaller than the sum of its proper divisors (4985525412).

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

2021157180 is a wasteful number, since it uses less digits than its factorization.

2021157180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604115 (or 1604110 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 2021157180 is about 44957.2817238765. The cubic root of 2021157180 is about 1264.3482047880.

Adding to 2021157180 its reverse (817511202), we get a palindrome (2838668382).

It can be divided in two parts, 2021 and 157180, that added together give a square (159201 = 399²).

The spelling of 2021157180 in words is "two billion, twenty-one million, one hundred fifty-seven thousand, one hundred eighty".