21740886064 has 10 divisors (see below), whose sum is σ = 42122966780. Its totient is φ = 10870443024.

The previous prime is 21740886049. The next prime is 21740886071. The reversal of 21740886064 is 46068804712.

It is a super-2 number, since 2×21740886064² (a number of 21 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 679402674 + ... + 679402705.

It is an arithmetic number, because the mean of its divisors is an integer number (4212296678).

Almost surely, 2^21740886064 is an apocalyptic number.

It is an amenable number.

21740886064 is a deficient number, since it is larger than the sum of its proper divisors (20382080716).

21740886064 is a wasteful number, since it uses less digits than its factorization.

21740886064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358805387 (or 1358805381 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 21740886064 in words is "twenty-one billion, seven hundred forty million, eight hundred eighty-six thousand, sixty-four".