213231521252 has 12 divisors (see below), whose sum is σ = 373334492076. Its totient is φ = 106564523520.

The previous prime is 213231521213. The next prime is 213231521257. The reversal of 213231521252 is 252125132312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 151083025636 + 62148495616 = 388694^2 + 249296^2 .

It is not an unprimeable number, because it can be changed into a prime (213231521257) 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, 12799913 + ... + 12816560.

It is an arithmetic number, because the mean of its divisors is an integer number (31111207673).

Almost surely, 2^213231521252 is an apocalyptic number.

It is an amenable number.

213231521252 is a deficient number, since it is larger than the sum of its proper divisors (160102970824).

213231521252 is a wasteful number, since it uses less digits than its factorization.

213231521252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25618558 (or 25618556 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

Adding to 213231521252 its reverse (252125132312), we get a palindrome (465356653564).

The spelling of 213231521252 in words is "two hundred thirteen billion, two hundred thirty-one million, five hundred twenty-one thousand, two hundred fifty-two".