21964261068 has 36 divisors (see below), whose sum is σ = 55528112640. Its totient is φ = 7320452256.

The previous prime is 21964261063. The next prime is 21964261073. The reversal of 21964261068 is 86016246912.

21964261068 is a `hidden beast` number, since 21 + 9 + 6 + 4 + 2 + 610 + 6 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (21964261063) and next prime (21964261073).

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21964261061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 267978 + ... + 340206.

Almost surely, 2^21964261068 is an apocalyptic number.

It is an amenable number.

21964261068 is an abundant number, since it is smaller than the sum of its proper divisors (33563851572).

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

21964261068 is a wasteful number, since it uses less digits than its factorization.

21964261068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80686 (or 80681 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 21964261068 in words is "twenty-one billion, nine hundred sixty-four million, two hundred sixty-one thousand, sixty-eight".