21036586408 has 32 divisors (see below), whose sum is σ = 40124160000. Its totient is φ = 10336917760.

The previous prime is 21036586357. The next prime is 21036586423. The reversal of 21036586408 is 80468563012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3040473 + ... + 3047383.

It is an arithmetic number, because the mean of its divisors is an integer number (1253880000).

Almost surely, 2^21036586408 is an apocalyptic number.

It is an amenable number.

21036586408 is a deficient number, since it is larger than the sum of its proper divisors (19087573592).

21036586408 is a wasteful number, since it uses less digits than its factorization.

21036586408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13425 (or 13421 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 21036586408 in words is "twenty-one billion, thirty-six million, five hundred eighty-six thousand, four hundred eight".