21107662968 has 128 divisors (see below), whose sum is σ = 63040320000. Its totient is φ = 5883575040.

The previous prime is 21107662907. The next prime is 21107662997. The reversal of 21107662968 is 86926670112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 306243 + ... + 368781.

It is an arithmetic number, because the mean of its divisors is an integer number (492502500).

Almost surely, 2^21107662968 is an apocalyptic number.

21107662968 is a gapful number since it is divisible by the number (28) 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 21107662968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31520160000).

21107662968 is an abundant number, since it is smaller than the sum of its proper divisors (41932657032).

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

21107662968 is a wasteful number, since it uses less digits than its factorization.

21107662968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62610 (or 62592 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 21107662968 in words is "twenty-one billion, one hundred seven million, six hundred sixty-two thousand, nine hundred sixty-eight".