21476564445620 has 48 divisors (see below), whose sum is σ = 46861518090240. Its totient is φ = 8257858057344.

The previous prime is 21476564445619. The next prime is 21476564445629. The reversal of 21476564445620 is 2654446567412.

It is a happy number.

It is a super-2 number, since 2×21476564445620² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21476564445629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81429044 + ... + 81692363.

It is an arithmetic number, because the mean of its divisors is an integer number (976281626880).

Almost surely, 2^{21476564445620} is an apocalyptic number.

21476564445620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21476564445620 is an abundant number, since it is smaller than the sum of its proper divisors (25384953644620).

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

21476564445620 is a wasteful number, since it uses less digits than its factorization.

21476564445620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163121672 (or 163121670 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 56.

The spelling of 21476564445620 in words is "twenty-one trillion, four hundred seventy-six billion, five hundred sixty-four million, four hundred forty-five thousand, six hundred twenty".