21014279664 has 80 divisors (see below), whose sum is σ = 62067456000. Its totient is φ = 6001632000.

The previous prime is 21014279639. The next prime is 21014279669. The reversal of 21014279664 is 46697241012.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014279669) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 912289 + ... + 935039.

It is an arithmetic number, because the mean of its divisors is an integer number (775843200).

Almost surely, 2^21014279664 is an apocalyptic number.

21014279664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21014279664 is an abundant number, since it is smaller than the sum of its proper divisors (41053176336).

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

21014279664 is a wasteful number, since it uses less digits than its factorization.

21014279664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25518 (or 25512 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 21014279664 in words is "twenty-one billion, fourteen million, two hundred seventy-nine thousand, six hundred sixty-four".