21715622752472 has 192 divisors, whose sum is σ = 47612514549600. Its totient is φ = 9252075571200.

The previous prime is 21715622752457. The next prime is 21715622752553. The reversal of 21715622752472 is 27425722651712.

It is a super-2 number, since 2×21715622752472² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 655786988 + ... + 655820100.

Almost surely, 2^{21715622752472} is an apocalyptic number.

21715622752472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21715622752472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23806257274800).

21715622752472 is an abundant number, since it is smaller than the sum of its proper divisors (25896891797128).

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

21715622752472 is a wasteful number, since it uses less digits than its factorization.

21715622752472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33538 (or 33523 counting only the distinct ones).

The product of its digits is 6585600, while the sum is 53.

The spelling of 21715622752472 in words is "twenty-one trillion, seven hundred fifteen billion, six hundred twenty-two million, seven hundred fifty-two thousand, four hundred seventy-two".