21963618020004 has 24 divisors (see below), whose sum is σ = 51291113555808. Its totient is φ = 7315110076800.

The previous prime is 21963618019961. The next prime is 21963618020011. The reversal of 21963618020004 is 40002081636912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 761976222 + ... + 762005045.

It is an arithmetic number, because the mean of its divisors is an integer number (2137129731492).

Almost surely, 2^{21963618020004} is an apocalyptic number.

It is an amenable number.

21963618020004 is an abundant number, since it is smaller than the sum of its proper divisors (29327495535804).

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

21963618020004 is a wasteful number, since it uses less digits than its factorization.

21963618020004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523982475 (or 1523982473 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

Adding to 21963618020004 its reverse (40002081636912), we get a palindrome (61965699656916).

The spelling of 21963618020004 in words is "twenty-one trillion, nine hundred sixty-three billion, six hundred eighteen million, twenty thousand, four".