21270726264 has 32 divisors (see below), whose sum is σ = 56304864720. Its totient is φ = 6673168896.

The previous prime is 21270726263. The next prime is 21270726277. The reversal of 21270726264 is 46262707212.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270726263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26066659 + ... + 26067474.

Almost surely, 2^21270726264 is an apocalyptic number.

21270726264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21270726264 is an abundant number, since it is smaller than the sum of its proper divisors (35034138456).

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

21270726264 is a wasteful number, since it uses less digits than its factorization.

21270726264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52134159 (or 52134155 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 39.

The spelling of 21270726264 in words is "twenty-one billion, two hundred seventy million, seven hundred twenty-six thousand, two hundred sixty-four".