21963636218004 has 96 divisors (see below), whose sum is σ = 56505991006080. Its totient is φ = 6597159948288.

The previous prime is 21963636217997. The next prime is 21963636218023. The reversal of 21963636218004 is 40081263636912.

It is a super-2 number, since 2×21963636218004² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10998832 + ... + 12841400.

It is an arithmetic number, because the mean of its divisors is an integer number (588604072980).

Almost surely, 2^{21963636218004} 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 21963636218004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28252995503040).

21963636218004 is an abundant number, since it is smaller than the sum of its proper divisors (34542354788076).

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

21963636218004 is a wasteful number, since it uses less digits than its factorization.

21963636218004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844409 (or 1844407 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 51.

The spelling of 21963636218004 in words is "twenty-one trillion, nine hundred sixty-three billion, six hundred thirty-six million, two hundred eighteen thousand, four".