213231520252 has 24 divisors (see below), whose sum is σ = 385212277296. Its totient is φ = 103214754048.

The previous prime is 213231520231. The next prime is 213231520291. The reversal of 213231520252 is 252025132312.

It is a super-2 number, since 2×213231520252² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213231520252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5466043 + ... + 5504914.

It is an arithmetic number, because the mean of its divisors is an integer number (16050511554).

Almost surely, 2^213231520252 is an apocalyptic number.

It is an amenable number.

213231520252 is a deficient number, since it is larger than the sum of its proper divisors (171980757044).

213231520252 is a wasteful number, since it uses less digits than its factorization.

213231520252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10971117 (or 10971115 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 213231520252 its reverse (252025132312), we get a palindrome (465256652564).

The spelling of 213231520252 in words is "two hundred thirteen billion, two hundred thirty-one million, five hundred twenty thousand, two hundred fifty-two".