21837981023 has 8 divisors (see below), whose sum is σ = 23124412080. Its totient is φ = 20551754880.

The previous prime is 21837981007. The next prime is 21837981047. The reversal of 21837981023 is 32018973812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21837981023 - 2⁴ = 21837981007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21837981083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204788 + ... + 292598.

It is an arithmetic number, because the mean of its divisors is an integer number (2890551510).

Almost surely, 2^21837981023 is an apocalyptic number.

21837981023 is a deficient number, since it is larger than the sum of its proper divisors (1286431057).

21837981023 is a wasteful number, since it uses less digits than its factorization.

21837981023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102457.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 21837981023 in words is "twenty-one billion, eight hundred thirty-seven million, nine hundred eighty-one thousand, twenty-three".