21305164460 has 12 divisors (see below), whose sum is σ = 44740845408. Its totient is φ = 8522065776.

The previous prime is 21305164421. The next prime is 21305164499. The reversal of 21305164460 is 6446150312.

It is an interprime number because it is at equal distance from previous prime (21305164421) and next prime (21305164499).

It is a super-3 number, since 3×21305164460³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532629092 + ... + 532629131.

It is an arithmetic number, because the mean of its divisors is an integer number (3728403784).

Almost surely, 2^21305164460 is an apocalyptic number.

21305164460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21305164460 is an abundant number, since it is smaller than the sum of its proper divisors (23435680948).

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

21305164460 is a wasteful number, since it uses less digits than its factorization.

21305164460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065258232 (or 1065258230 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 21305164460 in words is "twenty-one billion, three hundred five million, one hundred sixty-four thousand, four hundred sixty".