21152511452 has 12 divisors (see below), whose sum is σ = 37432815840. Its totient is φ = 10457421216.

The previous prime is 21152511451. The next prime is 21152511469. The reversal of 21152511452 is 25411525112.

It is a super-2 number, since 2×21152511452² (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 (21152511451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29708228 + ... + 29708939.

It is an arithmetic number, because the mean of its divisors is an integer number (3119401320).

Almost surely, 2^21152511452 is an apocalyptic number.

It is an amenable number.

21152511452 is a deficient number, since it is larger than the sum of its proper divisors (16280304388).

21152511452 is a wasteful number, since it uses less digits than its factorization.

21152511452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59417260 (or 59417258 counting only the distinct ones).

The product of its digits is 4000, while the sum is 29.

The spelling of 21152511452 in words is "twenty-one billion, one hundred fifty-two million, five hundred eleven thousand, four hundred fifty-two".