21234315252 has 24 divisors (see below), whose sum is σ = 49559231232. Its totient is φ = 7076320000.

The previous prime is 21234315233. The next prime is 21234315257. The reversal of 21234315252 is 25251343212.

It is a super-2 number, since 2×21234315252² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234315257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173124 + ... + 269147.

It is an arithmetic number, because the mean of its divisors is an integer number (2064967968).

Almost surely, 2^21234315252 is an apocalyptic number.

It is an amenable number.

21234315252 is an abundant number, since it is smaller than the sum of its proper divisors (28324915980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21234315252 is a wasteful number, since it uses less digits than its factorization.

21234315252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446279 (or 446277 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

Adding to 21234315252 its reverse (25251343212), we get a palindrome (46485658464).

The spelling of 21234315252 in words is "twenty-one billion, two hundred thirty-four million, three hundred fifteen thousand, two hundred fifty-two".