21436516686 has 24 divisors (see below), whose sum is σ = 46424647800. Its totient is φ = 6595850976.

The previous prime is 21436516613. The next prime is 21436516697. The reversal of 21436516686 is 68661563412.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10569261 + ... + 10571288.

It is an arithmetic number, because the mean of its divisors is an integer number (1934360325).

Almost surely, 2^21436516686 is an apocalyptic number.

21436516686 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21436516686 is an abundant number, since it is smaller than the sum of its proper divisors (24988131114).

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

21436516686 is a wasteful number, since it uses less digits than its factorization.

21436516686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21140580 (or 21140567 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 48.

The spelling of 21436516686 in words is "twenty-one billion, four hundred thirty-six million, five hundred sixteen thousand, six hundred eighty-six".