213243264531 has 48 divisors (see below), whose sum is σ = 360796819968. Its totient is φ = 119922835200.

The previous prime is 213243264511. The next prime is 213243264539. The reversal of 213243264531 is 135462342312.

213243264531 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 4 + 3 + 2 + 645 + 3 + 1 = 666.

It is not a de Polignac number, because 213243264531 - 2⁶ = 213243264467 is a prime.

It is a super-2 number, since 2×213243264531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213243264539) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 772791 + ... + 1011776.

It is an arithmetic number, because the mean of its divisors is an integer number (7516600416).

Almost surely, 2^213243264531 is an apocalyptic number.

213243264531 is a deficient number, since it is larger than the sum of its proper divisors (147553555437).

213243264531 is a wasteful number, since it uses less digits than its factorization.

213243264531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784672 (or 1784669 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

It can be divided in two parts, 213243 and 264531, that added together give a palindrome (477774).

The spelling of 213243264531 in words is "two hundred thirteen billion, two hundred forty-three million, two hundred sixty-four thousand, five hundred thirty-one".