21306470616 has 48 divisors (see below), whose sum is σ = 57711827160. Its totient is φ = 7101319680.

The previous prime is 21306470573. The next prime is 21306470621. The reversal of 21306470616 is 61607460312.

It is a happy number.

21306470616 is a `hidden beast` number, since 2 + 1 + 3 + 0 + 647 + 0 + 6 + 1 + 6 = 666.

It is a super-2 number, since 2×21306470616² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1038231 + ... + 1058553.

Almost surely, 2^21306470616 is an apocalyptic number.

It is an amenable number.

21306470616 is an abundant number, since it is smaller than the sum of its proper divisors (36405356544).

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

21306470616 is a wasteful number, since it uses less digits than its factorization.

21306470616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34896 (or 34889 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

It can be divided in two parts, 2130 and 6470616, that added together give a palindrome (6472746).

The spelling of 21306470616 in words is "twenty-one billion, three hundred six million, four hundred seventy thousand, six hundred sixteen".