21317963454 has 20 divisors (see below), whose sum is σ = 47768029584. Its totient is φ = 7105987764.

The previous prime is 21317963437. The next prime is 21317963473. The reversal of 21317963454 is 45436971312.

21317963454 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 7 + 9 + 634 + 5 + 4 = 666.

It is a super-2 number, since 2×21317963454² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 65796022 + ... + 65796345.

Almost surely, 2^21317963454 is an apocalyptic number.

21317963454 is an abundant number, since it is smaller than the sum of its proper divisors (26450066130).

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

21317963454 is a wasteful number, since it uses less digits than its factorization.

21317963454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131592381 (or 131592372 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The spelling of 21317963454 in words is "twenty-one billion, three hundred seventeen million, nine hundred sixty-three thousand, four hundred fifty-four".