21982869638 has 8 divisors (see below), whose sum is σ = 32981566800. Its totient is φ = 10989014040.

The previous prime is 21982869631. The next prime is 21982869659. The reversal of 21982869638 is 83696828912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21982869631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1199018 + ... + 1217213.

It is an arithmetic number, because the mean of its divisors is an integer number (4122695850).

Almost surely, 2^21982869638 is an apocalyptic number.

21982869638 is a deficient number, since it is larger than the sum of its proper divisors (10998697162).

21982869638 is a wasteful number, since it uses less digits than its factorization.

21982869638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420782.

The product of its digits is 17915904, while the sum is 62.

The spelling of 21982869638 in words is "twenty-one billion, nine hundred eighty-two million, eight hundred sixty-nine thousand, six hundred thirty-eight".