213531023015 has 4 divisors (see below), whose sum is σ = 256237227624. Its totient is φ = 170824818408.

The previous prime is 213531023003. The next prime is 213531023059. The reversal of 213531023015 is 510320135312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213531023015 - 2³² = 209236055719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21353102297 + ... + 21353102306.

It is an arithmetic number, because the mean of its divisors is an integer number (64059306906).

Almost surely, 2^213531023015 is an apocalyptic number.

213531023015 is a deficient number, since it is larger than the sum of its proper divisors (42706204609).

213531023015 is an equidigital number, since it uses as much as digits as its factorization.

213531023015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42706204608.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 213531023015 its reverse (510320135312), we get a palindrome (723851158327).

The spelling of 213531023015 in words is "two hundred thirteen billion, five hundred thirty-one million, twenty-three thousand, fifteen".