21938702604 has 192 divisors, whose sum is σ = 65278574592. Its totient is φ = 5578502400.

The previous prime is 21938702593. The next prime is 21938702689. The reversal of 21938702604 is 40620783912.

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 63 ways as a sum of consecutive naturals, for example, 10391509 + ... + 10393619.

It is an arithmetic number, because the mean of its divisors is an integer number (339992576).

Almost surely, 2^21938702604 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 21938702604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32639287296).

21938702604 is an abundant number, since it is smaller than the sum of its proper divisors (43339871988).

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

21938702604 is a wasteful number, since it uses less digits than its factorization.

21938702604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2476 (or 2474 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 21938702604 in words is "twenty-one billion, nine hundred thirty-eight million, seven hundred two thousand, six hundred four".