21902039972736 has 1536 divisors, whose sum is σ = 76905545472000. Its totient is φ = 5401313280000.

The previous prime is 21902039972723. The next prime is 21902039972821. The reversal of 21902039972736 is 63727993020912.

It is a self number, because there is not a number n which added to its sum of digits gives 21902039972736.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 145046622261 + ... + 145046622411.

It is an arithmetic number, because the mean of its divisors is an integer number (50068714500).

Almost surely, 2^{21902039972736} 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 21902039972736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38452772736000).

21902039972736 is an abundant number, since it is smaller than the sum of its proper divisors (55003505499264).

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

21902039972736 is a wasteful number, since it uses less digits than its factorization.

21902039972736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 15431472, while the sum is 60.

The spelling of 21902039972736 in words is "twenty-one trillion, nine hundred two billion, thirty-nine million, nine hundred seventy-two thousand, seven hundred thirty-six".