21982638238 has 8 divisors (see below), whose sum is σ = 35971589880. Its totient is φ = 9992108280.

The previous prime is 21982638211. The next prime is 21982638241. The reversal of 21982638238 is 83283628912.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499605393 + ... + 499605436.

It is an arithmetic number, because the mean of its divisors is an integer number (4496448735).

Almost surely, 2^21982638238 is an apocalyptic number.

21982638238 is a deficient number, since it is larger than the sum of its proper divisors (13988951642).

21982638238 is a wasteful number, since it uses less digits than its factorization.

21982638238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999210842.

The product of its digits is 1990656, while the sum is 52.

It can be divided in two parts, 219826 and 38238, that added together give a square (258064 = 508²).

The spelling of 21982638238 in words is "twenty-one billion, nine hundred eighty-two million, six hundred thirty-eight thousand, two hundred thirty-eight".