21814971338 has 4 divisors (see below), whose sum is σ = 32722457010. Its totient is φ = 10907485668.

The previous prime is 21814971313. The next prime is 21814971361. The reversal of 21814971338 is 83317941812.

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

It can be written as a sum of positive squares in only one way, i.e., 19228536889 + 2586434449 = 138667^2 + 50857^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21814971292 and 21814971301.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5453742833 + ... + 5453742836.

Almost surely, 2^21814971338 is an apocalyptic number.

21814971338 is a deficient number, since it is larger than the sum of its proper divisors (10907485672).

21814971338 is a wasteful number, since it uses less digits than its factorization.

21814971338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10907485671.

The product of its digits is 290304, while the sum is 47.

The spelling of 21814971338 in words is "twenty-one billion, eight hundred fourteen million, nine hundred seventy-one thousand, three hundred thirty-eight".