21502323242452 has 36 divisors (see below), whose sum is σ = 40753016844960. Its totient is φ = 9922505048352.

The previous prime is 21502323242401. The next prime is 21502323242471. The reversal of 21502323242452 is 25424232320512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1453249 + ... + 6716887.

Almost surely, 2^{21502323242452} is an apocalyptic number.

It is an amenable number.

21502323242452 is a deficient number, since it is larger than the sum of its proper divisors (19250693602508).

21502323242452 is a wasteful number, since it uses less digits than its factorization.

21502323242452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5269712 (or 5269697 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 37.

Adding to 21502323242452 its reverse (25424232320512), we get a palindrome (46926555562964).

The spelling of 21502323242452 in words is "twenty-one trillion, five hundred two billion, three hundred twenty-three million, two hundred forty-two thousand, four hundred fifty-two".