21726171467420 has 24 divisors (see below), whose sum is σ = 52142811522144. Its totient is φ = 7448973074496.

The previous prime is 21726171467419. The next prime is 21726171467501. The reversal of 21726171467420 is 2476417162712.

It is a super-2 number, since 2×21726171467420² (a number of 27 digits) contains 22 as substring.

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, 77593469387 + ... + 77593469666.

It is an arithmetic number, because the mean of its divisors is an integer number (2172617146756).

Almost surely, 2^{21726171467420} is an apocalyptic number.

21726171467420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21726171467420 is an abundant number, since it is smaller than the sum of its proper divisors (30416640054724).

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

21726171467420 is a wasteful number, since it uses less digits than its factorization.

21726171467420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155186939069 (or 155186939067 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 21726171467420 in words is "twenty-one trillion, seven hundred twenty-six billion, one hundred seventy-one million, four hundred sixty-seven thousand, four hundred twenty".