21736851684 has 48 divisors (see below), whose sum is σ = 54631772160. Its totient is φ = 6707020320.

The previous prime is 21736851679. The next prime is 21736851733. The reversal of 21736851684 is 48615863712.

It is a super-2 number, since 2×21736851684² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1261714 + ... + 1278825.

It is an arithmetic number, because the mean of its divisors is an integer number (1138161920).

Almost surely, 2^21736851684 is an apocalyptic number.

It is an amenable number.

21736851684 is an abundant number, since it is smaller than the sum of its proper divisors (32894920476).

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

21736851684 is a wasteful number, since it uses less digits than its factorization.

21736851684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540600 (or 2540598 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The spelling of 21736851684 in words is "twenty-one billion, seven hundred thirty-six million, eight hundred fifty-one thousand, six hundred eighty-four".