21420726264 has 64 divisors (see below), whose sum is σ = 68002310400. Its totient is φ = 6120207072.

The previous prime is 21420726259. The next prime is 21420726287. The reversal of 21420726264 is 46262702412.

21420726264 is a `hidden beast` number, since 2 + 1 + 4 + 20 + 7 + 2 + 626 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7082062 + ... + 7085085.

It is an arithmetic number, because the mean of its divisors is an integer number (1062536100).

Almost surely, 2^21420726264 is an apocalyptic number.

21420726264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21420726264 is an abundant number, since it is smaller than the sum of its proper divisors (46581584136).

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

21420726264 is a wasteful number, since it uses less digits than its factorization.

21420726264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14167169 (or 14167159 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

It can be divided in two parts, 214207 and 26264, that added together give a triangular number (240471 = T₆₉₃).

The spelling of 21420726264 in words is "twenty-one billion, four hundred twenty million, seven hundred twenty-six thousand, two hundred sixty-four".