21502131123252 has 36 divisors (see below), whose sum is σ = 54327869766240. Its totient is φ = 6616040344992.

The previous prime is 21502131123247. The next prime is 21502131123271. The reversal of 21502131123252 is 25232113120512.

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, 5301312352 + ... + 5301316407.

Almost surely, 2^{21502131123252} is an apocalyptic number.

It is an amenable number.

21502131123252 is an abundant number, since it is smaller than the sum of its proper divisors (32825738642988).

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

21502131123252 is a wasteful number, since it uses less digits than its factorization.

21502131123252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10602628792 (or 10602628777 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 21502131123252 its reverse (25232113120512), we get a palindrome (46734244243764).

The spelling of 21502131123252 in words is "twenty-one trillion, five hundred two billion, one hundred thirty-one million, one hundred twenty-three thousand, two hundred fifty-two".