21702191702604 has 384 divisors, whose sum is σ = 63608576016384. Its totient is φ = 5627314944000.

The previous prime is 21702191702561. The next prime is 21702191702629. The reversal of 21702191702604 is 40620719120712.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 327839149 + ... + 327905339.

It is an arithmetic number, because the mean of its divisors is an integer number (165647333376).

Almost surely, 2^{21702191702604} 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 21702191702604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31804288008192).

21702191702604 is an abundant number, since it is smaller than the sum of its proper divisors (41906384313780).

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

21702191702604 is a wasteful number, since it uses less digits than its factorization.

21702191702604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66397 (or 66395 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 21702191702604 in words is "twenty-one trillion, seven hundred two billion, one hundred ninety-one million, seven hundred two thousand, six hundred four".