21440476741632 has 160 divisors (see below), whose sum is σ = 61572651155400. Its totient is φ = 6597069766656.

The previous prime is 21440476741603. The next prime is 21440476741639. The reversal of 21440476741632 is 23614767404412.

It is an ABA number since it can be written as A⋅B^A, here for A=39, B=2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440476741639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1649267441658 + ... + 1649267441670.

Almost surely, 2^{21440476741632} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21440476741632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30786325577700).

21440476741632 is an abundant number, since it is smaller than the sum of its proper divisors (40132174413768).

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

21440476741632 is an frugal number, since it uses more digits than its factorization.

21440476741632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 51.

The spelling of 21440476741632 in words is "twenty-one trillion, four hundred forty billion, four hundred seventy-six million, seven hundred forty-one thousand, six hundred thirty-two".