21901717402319 has 8 divisors (see below), whose sum is σ = 22260934234320. Its totient is φ = 21542506128000.

The previous prime is 21901717402283. The next prime is 21901717402321. The reversal of 21901717402319 is 91320471710912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21901717402319 is a prime.

It is a super-2 number, since 2×21901717402319² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21901717402339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6965447 + ... + 9608375.

It is an arithmetic number, because the mean of its divisors is an integer number (2782616779290).

Almost surely, 2^{21901717402319} is an apocalyptic number.

21901717402319 is a deficient number, since it is larger than the sum of its proper divisors (359216832001).

21901717402319 is a wasteful number, since it uses less digits than its factorization.

21901717402319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778841.

The product of its (nonzero) digits is 190512, while the sum is 47.

The spelling of 21901717402319 in words is "twenty-one trillion, nine hundred one billion, seven hundred seventeen million, four hundred two thousand, three hundred nineteen".