21374260637632 has 168 divisors, whose sum is σ = 50685068860800. Its totient is φ = 8910673422336.

The previous prime is 21374260637621. The next prime is 21374260637659. The reversal of 21374260637632 is 23673606247312.

It is a happy number.

It is a super-2 number, since 2×21374260637632² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21374260637632.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 538252594 + ... + 538292302.

Almost surely, 2^{21374260637632} 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 21374260637632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25342534430400).

21374260637632 is an abundant number, since it is smaller than the sum of its proper divisors (29310808223168).

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

21374260637632 is a wasteful number, since it uses less digits than its factorization.

21374260637632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44411 (or 44394 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 52.

The spelling of 21374260637632 in words is "twenty-one trillion, three hundred seventy-four billion, two hundred sixty million, six hundred thirty-seven thousand, six hundred thirty-two".