21067684260 has 96 divisors (see below), whose sum is σ = 68792505600. Its totient is φ = 4815465984.

The previous prime is 21067684241. The next prime is 21067684273. The reversal of 21067684260 is 6248676012.

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

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, 491269 + ... + 532428.

It is an arithmetic number, because the mean of its divisors is an integer number (716588600).

Almost surely, 2^21067684260 is an apocalyptic number.

21067684260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21067684260 is an abundant number, since it is smaller than the sum of its proper divisors (47724821340).

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

21067684260 is a wasteful number, since it uses less digits than its factorization.

21067684260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023730 (or 1023714 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 21067684260 in words is "twenty-one billion, sixty-seven million, six hundred eighty-four thousand, two hundred sixty".