21679970676 has 96 divisors (see below), whose sum is σ = 62302222080. Its totient is φ = 5713956864.

The previous prime is 21679970671. The next prime is 21679970677. The reversal of 21679970676 is 67607997612.

It is a super-2 number, since 2×21679970676² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21679970671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1860420 + ... + 1872036.

It is an arithmetic number, because the mean of its divisors is an integer number (648981480).

Almost surely, 2^21679970676 is an apocalyptic number.

21679970676 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21679970676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31151111040).

21679970676 is an abundant number, since it is smaller than the sum of its proper divisors (40622251404).

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

21679970676 is a wasteful number, since it uses less digits than its factorization.

21679970676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13353 (or 13351 counting only the distinct ones).

The product of its (nonzero) digits is 12002256, while the sum is 60.

The spelling of 21679970676 in words is "twenty-one billion, six hundred seventy-nine million, nine hundred seventy thousand, six hundred seventy-six".