21866689423574 has 4 divisors (see below), whose sum is σ = 32800034135364. Its totient is φ = 10933344711786.

The previous prime is 21866689423541. The next prime is 21866689423609. The reversal of 21866689423574 is 47532498666812.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21866689423498 and 21866689423507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5466672355892 + ... + 5466672355895.

It is an arithmetic number, because the mean of its divisors is an integer number (8200008533841).

Almost surely, 2^{21866689423574} is an apocalyptic number.

21866689423574 is a deficient number, since it is larger than the sum of its proper divisors (10933344711790).

21866689423574 is a wasteful number, since it uses less digits than its factorization.

21866689423574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10933344711789.

The product of its digits is 836075520, while the sum is 71.

The spelling of 21866689423574 in words is "twenty-one trillion, eight hundred sixty-six billion, six hundred eighty-nine million, four hundred twenty-three thousand, five hundred seventy-four".