21404463717 has 32 divisors (see below), whose sum is σ = 37191474432. Its totient is φ = 10626130944.

The previous prime is 21404463697. The next prime is 21404463721. The reversal of 21404463717 is 71736440412.

It is not a de Polignac number, because 21404463717 - 2⁸ = 21404463461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404463317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2301378 + ... + 2310659.

It is an arithmetic number, because the mean of its divisors is an integer number (1162233576).

Almost surely, 2^21404463717 is an apocalyptic number.

It is an amenable number.

21404463717 is a deficient number, since it is larger than the sum of its proper divisors (15787010715).

21404463717 is a wasteful number, since it uses less digits than its factorization.

21404463717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4612077.

The product of its (nonzero) digits is 112896, while the sum is 39.

The spelling of 21404463717 in words is "twenty-one billion, four hundred four million, four hundred sixty-three thousand, seven hundred seventeen".