21696679753782 has 16 divisors (see below), whose sum is σ = 47338210372032. Its totient is φ = 6574751440520.

The previous prime is 21696679753769. The next prime is 21696679753799. The reversal of 21696679753782 is 28735797669612.

It is a junction number, because it is equal to n+sod(n) for n = 21696679753698 and 21696679753707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164368785948 + ... + 164368786079.

It is an arithmetic number, because the mean of its divisors is an integer number (2958638148252).

Almost surely, 2^{21696679753782} is an apocalyptic number.

21696679753782 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21696679753782 is an abundant number, since it is smaller than the sum of its proper divisors (25641530618250).

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

21696679753782 is a wasteful number, since it uses less digits than its factorization.

21696679753782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328737572043.

The product of its digits is 2880541440, while the sum is 78.

The spelling of 21696679753782 in words is "twenty-one trillion, six hundred ninety-six billion, six hundred seventy-nine million, seven hundred fifty-three thousand, seven hundred eighty-two".