21064584476 has 24 divisors (see below), whose sum is σ = 40049966544. Its totient is φ = 9636076800.

The previous prime is 21064584419. The next prime is 21064584493. The reversal of 21064584476 is 67448546012.

It is a happy number.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21064584476.

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, 1786550 + ... + 1798301.

It is an arithmetic number, because the mean of its divisors is an integer number (1668748606).

Almost surely, 2^21064584476 is an apocalyptic number.

21064584476 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21064584476 is a deficient number, since it is larger than the sum of its proper divisors (18985382068).

21064584476 is a wasteful number, since it uses less digits than its factorization.

21064584476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584981 (or 3584979 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 47.

The spelling of 21064584476 in words is "twenty-one billion, sixty-four million, five hundred eighty-four thousand, four hundred seventy-six".