213431516021 has 8 divisors (see below), whose sum is σ = 220873780920. Its totient is φ = 205994755008.

The previous prime is 213431516017. The next prime is 213431516033. The reversal of 213431516021 is 120615134312.

It can be written as a sum of positive squares in 4 ways, for example, as 251698225 + 213179817796 = 15865^2 + 461714^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213431516021 - 2² = 213431516017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213431516521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296986 + ... + 1452251.

It is an arithmetic number, because the mean of its divisors is an integer number (27609222615).

Almost surely, 2^213431516021 is an apocalyptic number.

It is an amenable number.

213431516021 is a deficient number, since it is larger than the sum of its proper divisors (7442264899).

213431516021 is a wasteful number, since it uses less digits than its factorization.

213431516021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751943.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 213431516021 in words is "two hundred thirteen billion, four hundred thirty-one million, five hundred sixteen thousand, twenty-one".