21152443504 has 40 divisors (see below), whose sum is σ = 41643615888. Its totient is φ = 10406077440.

The previous prime is 21152443463. The next prime is 21152443517. The reversal of 21152443504 is 40534425112.

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, 933234 + ... + 955630.

Almost surely, 2^21152443504 is an apocalyptic number.

It is an amenable number.

21152443504 is a deficient number, since it is larger than the sum of its proper divisors (20491172384).

21152443504 is a wasteful number, since it uses less digits than its factorization.

21152443504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23353 (or 23347 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21152443504 its reverse (40534425112), we get a palindrome (61686868616).

The spelling of 21152443504 in words is "twenty-one billion, one hundred fifty-two million, four hundred forty-three thousand, five hundred four".