21697006960 has 20 divisors (see below), whose sum is σ = 50445541368. Its totient is φ = 8678802752.

The previous prime is 21697006957. The next prime is 21697006963. The reversal of 21697006960 is 6960079612.

It is an interprime number because it is at equal distance from previous prime (21697006957) and next prime (21697006963).

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×21697006960² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21697006960.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21697006963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135606214 + ... + 135606373.

Almost surely, 2^21697006960 is an apocalyptic number.

21697006960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21697006960 is an abundant number, since it is smaller than the sum of its proper divisors (28748534408).

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

21697006960 is a wasteful number, since it uses less digits than its factorization.

21697006960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271212600 (or 271212594 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 21697006960 in words is "twenty-one billion, six hundred ninety-seven million, six thousand, nine hundred sixty".