21746979696 has 160 divisors (see below), whose sum is σ = 62928194560. Its totient is φ = 6427579392.

The previous prime is 21746979677. The next prime is 21746979697. The reversal of 21746979696 is 69697964712.

It is a super-2 number, since 2×21746979696² (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 (21746979697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1817991 + ... + 1829913.

It is an arithmetic number, because the mean of its divisors is an integer number (393301216).

Almost surely, 2^21746979696 is an apocalyptic number.

21746979696 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 21746979696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31464097280).

21746979696 is an abundant number, since it is smaller than the sum of its proper divisors (41181214864).

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

21746979696 is a wasteful number, since it uses less digits than its factorization.

21746979696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12063 (or 12057 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 66.

The spelling of 21746979696 in words is "twenty-one billion, seven hundred forty-six million, nine hundred seventy-nine thousand, six hundred ninety-six".