21152472416 has 12 divisors (see below), whose sum is σ = 41643930132. Its totient is φ = 10576236192.

The previous prime is 21152472413. The next prime is 21152472431. The reversal of 21152472416 is 61427425112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152472413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330507350 + ... + 330507413.

It is an arithmetic number, because the mean of its divisors is an integer number (3470327511).

Almost surely, 2^21152472416 is an apocalyptic number.

It is an amenable number.

21152472416 is a deficient number, since it is larger than the sum of its proper divisors (20491457716).

21152472416 is an equidigital number, since it uses as much as digits as its factorization.

21152472416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661014773 (or 661014765 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

Adding to 21152472416 its reverse (61427425112), we get a palindrome (82579897528).

The spelling of 21152472416 in words is "twenty-one billion, one hundred fifty-two million, four hundred seventy-two thousand, four hundred sixteen".