21717893626 has 32 divisors (see below), whose sum is σ = 39306492288. Its totient is φ = 8866117440.

The previous prime is 21717893611. The next prime is 21717893629. The reversal of 21717893626 is 62639871712.

It is not an unprimeable number, because it can be changed into a prime (21717893629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015590 + ... + 1036753.

It is an arithmetic number, because the mean of its divisors is an integer number (1228327884).

Almost surely, 2^21717893626 is an apocalyptic number.

21717893626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21717893626 is a deficient number, since it is larger than the sum of its proper divisors (17588598662).

21717893626 is a wasteful number, since it uses less digits than its factorization.

21717893626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2052406.

The product of its digits is 1524096, while the sum is 52.

The spelling of 21717893626 in words is "twenty-one billion, seven hundred seventeen million, eight hundred ninety-three thousand, six hundred twenty-six".