213513015423531 has 4 divisors (see below), whose sum is σ = 284684020564712. Its totient is φ = 142342010282352.

The previous prime is 213513015423517. The next prime is 213513015423581. The reversal of 213513015423531 is 135324510315312.

It is a happy number.

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

It is not a de Polignac number, because 213513015423531 - 2⁷ = 213513015423403 is a prime.

It is a super-2 number, since 2×213513015423531² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213513015423531.

It is not an unprimeable number, because it can be changed into a prime (213513015423581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35585502570586 + ... + 35585502570591.

It is an arithmetic number, because the mean of its divisors is an integer number (71171005141178).

Almost surely, 2^{213513015423531} is an apocalyptic number.

213513015423531 is a deficient number, since it is larger than the sum of its proper divisors (71171005141181).

213513015423531 is an equidigital number, since it uses as much as digits as its factorization.

213513015423531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71171005141180.

The product of its (nonzero) digits is 162000, while the sum is 39.

Adding to 213513015423531 its reverse (135324510315312), we get a palindrome (348837525738843).

The spelling of 213513015423531 in words is "two hundred thirteen trillion, five hundred thirteen billion, fifteen million, four hundred twenty-three thousand, five hundred thirty-one".