21511652252 has 24 divisors (see below), whose sum is σ = 38091502176. Its totient is φ = 10628932608.

The previous prime is 21511652231. The next prime is 21511652293. The reversal of 21511652252 is 25225611512.

It is a happy number.

It is a super-2 number, since 2×21511652252² (a number of 21 digits) contains 22 as substring.

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, 81713 + ... + 222935.

It is an arithmetic number, because the mean of its divisors is an integer number (1587145924).

Almost surely, 2^21511652252 is an apocalyptic number.

It is an amenable number.

21511652252 is a deficient number, since it is larger than the sum of its proper divisors (16579849924).

21511652252 is a wasteful number, since it uses less digits than its factorization.

21511652252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141677 (or 141675 counting only the distinct ones).

The product of its digits is 12000, while the sum is 32.

The spelling of 21511652252 in words is "twenty-one billion, five hundred eleven million, six hundred fifty-two thousand, two hundred fifty-two".