21401596959568 has 40 divisors (see below), whose sum is σ = 47540653844288. Its totient is φ = 9142809092352.

The previous prime is 21401596959551. The next prime is 21401596959571. The reversal of 21401596959568 is 86595969510412.

It is a junction number, because it is equal to n+sod(n) for n = 21401596959497 and 21401596959506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305213646 + ... + 305283757.

Almost surely, 2^{21401596959568} is an apocalyptic number.

21401596959568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21401596959568 is an abundant number, since it is smaller than the sum of its proper divisors (26139056884720).

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

21401596959568 is a wasteful number, since it uses less digits than its factorization.

21401596959568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610497731 (or 610497725 counting only the distinct ones).

The product of its (nonzero) digits is 209952000, while the sum is 70.

The spelling of 21401596959568 in words is "twenty-one trillion, four hundred one billion, five hundred ninety-six million, nine hundred fifty-nine thousand, five hundred sixty-eight".