21430320137664 has 28 divisors (see below), whose sum is σ = 56701055364744. Its totient is φ = 7143440045824.

The previous prime is 21430320137651. The next prime is 21430320137689. The reversal of 21430320137664 is 46673102303412.

It is a happy number.

21430320137664 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21430320137664² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55808125167 + ... + 55808125550.

It is an arithmetic number, because the mean of its divisors is an integer number (2025037691598).

Almost surely, 2^{21430320137664} is an apocalyptic number.

21430320137664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21430320137664 is an abundant number, since it is smaller than the sum of its proper divisors (35270735227080).

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

21430320137664 is a wasteful number, since it uses less digits than its factorization.

21430320137664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111616250732 (or 111616250722 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 42.

The spelling of 21430320137664 in words is "twenty-one trillion, four hundred thirty billion, three hundred twenty million, one hundred thirty-seven thousand, six hundred sixty-four".