21506152152 has 32 divisors (see below), whose sum is σ = 54501896880. Its totient is φ = 7070515200.

The previous prime is 21506152097. The next prime is 21506152159. The reversal of 21506152152 is 25125160512.

It is a super-2 number, since 2×21506152152² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21506152159) 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, 6135849 + ... + 6139352.

Almost surely, 2^21506152152 is an apocalyptic number.

It is an amenable number.

21506152152 is an abundant number, since it is smaller than the sum of its proper divisors (32995744728).

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

21506152152 is a wasteful number, since it uses less digits than its factorization.

21506152152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12275283 (or 12275279 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

The spelling of 21506152152 in words is "twenty-one billion, five hundred six million, one hundred fifty-two thousand, one hundred fifty-two".