21696317438 has 8 divisors (see below), whose sum is σ = 32550663888. Its totient is φ = 10846096144.

The previous prime is 21696317437. The next prime is 21696317459. The reversal of 21696317438 is 83471369612.

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 (21696317431) 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, 1018106 + ... + 1039197.

It is an arithmetic number, because the mean of its divisors is an integer number (4068832986).

Almost surely, 2^21696317438 is an apocalyptic number.

21696317438 is a deficient number, since it is larger than the sum of its proper divisors (10854346450).

21696317438 is a wasteful number, since it uses less digits than its factorization.

21696317438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062578.

The product of its digits is 1306368, while the sum is 50.

The spelling of 21696317438 in words is "twenty-one billion, six hundred ninety-six million, three hundred seventeen thousand, four hundred thirty-eight".