21260964510 has 64 divisors (see below), whose sum is σ = 58078762560. Its totient is φ = 5531304960.

The previous prime is 21260964467. The next prime is 21260964523. The reversal of 21260964510 is 1546906212.

21260964510 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 0 + 9 + 645 + 1 + 0 = 666.

It is a super-2 number, since 2×21260964510² (a number of 21 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 31 ways as a sum of consecutive naturals, for example, 949227 + ... + 971366.

It is an arithmetic number, because the mean of its divisors is an integer number (907480665).

Almost surely, 2^21260964510 is an apocalyptic number.

21260964510 is an abundant number, since it is smaller than the sum of its proper divisors (36817798050).

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

21260964510 is a wasteful number, since it uses less digits than its factorization.

21260964510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920650 (or 1920644 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 21260964510 in words is "twenty-one billion, two hundred sixty million, nine hundred sixty-four thousand, five hundred ten".