21983797681923 has 192 divisors, whose sum is σ = 38834479824896. Its totient is φ = 10814179622400.

The previous prime is 21983797681919. The next prime is 21983797681931. The reversal of 21983797681923 is 32918679738912.

It is not a de Polignac number, because 21983797681923 - 2² = 21983797681919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21983797681973) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 730270890 + ... + 730300992.

Almost surely, 2^{21983797681923} is an apocalyptic number.

21983797681923 is a deficient number, since it is larger than the sum of its proper divisors (16850682142973).

21983797681923 is a wasteful number, since it uses less digits than its factorization.

21983797681923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30366 (or 30355 counting only the distinct ones).

The product of its digits is 493807104, while the sum is 75.

The spelling of 21983797681923 in words is "twenty-one trillion, nine hundred eighty-three billion, seven hundred ninety-seven million, six hundred eighty-one thousand, nine hundred twenty-three".