21152251532 has 12 divisors (see below), whose sum is σ = 37462421976. Its totient is φ = 10448702400.

The previous prime is 21152251529. The next prime is 21152251567. The reversal of 21152251532 is 23515225112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21152251495 and 21152251504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31855469 + ... + 31856132.

It is an arithmetic number, because the mean of its divisors is an integer number (3121868498).

Almost surely, 2^21152251532 is an apocalyptic number.

It is an amenable number.

21152251532 is a deficient number, since it is larger than the sum of its proper divisors (16310170444).

21152251532 is a wasteful number, since it uses less digits than its factorization.

21152251532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63711688 (or 63711686 counting only the distinct ones).

The product of its digits is 6000, while the sum is 29.

Adding to 21152251532 its reverse (23515225112), we get a palindrome (44667476644).

The spelling of 21152251532 in words is "twenty-one billion, one hundred fifty-two million, two hundred fifty-one thousand, five hundred thirty-two".