21983794343644 has 36 divisors (see below), whose sum is σ = 44841696019344. Its totient is φ = 9402895238016.

The previous prime is 21983794343617. The next prime is 21983794343683. The reversal of 21983794343644 is 44634349738912.

It is a self number, because there is not a number n which added to its sum of digits gives 21983794343644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111394669 + ... + 111591844.

It is an arithmetic number, because the mean of its divisors is an integer number (1245602667204).

Almost surely, 2^{21983794343644} is an apocalyptic number.

It is an amenable number.

21983794343644 is an abundant number, since it is smaller than the sum of its proper divisors (22857901675700).

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

21983794343644 is a wasteful number, since it uses less digits than its factorization.

21983794343644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222987034 (or 222987025 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 67.

The spelling of 21983794343644 in words is "twenty-one trillion, nine hundred eighty-three billion, seven hundred ninety-four million, three hundred forty-three thousand, six hundred forty-four".