21338905567 has 8 divisors (see below), whose sum is σ = 25670864000. Its totient is φ = 17327832984.

The previous prime is 21338905561. The next prime is 21338905571. The reversal of 21338905567 is 76550983312.

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

It is not a de Polignac number, because 21338905567 - 2⁷ = 21338905439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21338905567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338905561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80221317 + ... + 80221582.

It is an arithmetic number, because the mean of its divisors is an integer number (3208858000).

Almost surely, 2^21338905567 is an apocalyptic number.

21338905567 is a deficient number, since it is larger than the sum of its proper divisors (4331958433).

21338905567 is a wasteful number, since it uses less digits than its factorization.

21338905567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160442925.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 21338905567 in words is "twenty-one billion, three hundred thirty-eight million, nine hundred five thousand, five hundred sixty-seven".