21914174639 has 4 divisors (see below), whose sum is σ = 25044771024. Its totient is φ = 18783578256.

The previous prime is 21914174621. The next prime is 21914174663. The reversal of 21914174639 is 93647141912.

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

It is a cyclic number.

It is not a de Polignac number, because 21914174639 - 2²⁸ = 21645739183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21914174593 and 21914174602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21914174239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1565298182 + ... + 1565298195.

It is an arithmetic number, because the mean of its divisors is an integer number (6261192756).

Almost surely, 2^21914174639 is an apocalyptic number.

21914174639 is a deficient number, since it is larger than the sum of its proper divisors (3130596385).

21914174639 is an equidigital number, since it uses as much as digits as its factorization.

21914174639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3130596384.

The product of its digits is 326592, while the sum is 47.

The spelling of 21914174639 in words is "twenty-one billion, nine hundred fourteen million, one hundred seventy-four thousand, six hundred thirty-nine".