21669925255 has 8 divisors (see below), whose sum is σ = 28367902224. Its totient is φ = 15759945600.

The previous prime is 21669925237. The next prime is 21669925261. The reversal of 21669925255 is 55252996612.

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

It is not a de Polignac number, because 21669925255 - 2⁵ = 21669925223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196999266 + ... + 196999375.

It is an arithmetic number, because the mean of its divisors is an integer number (3545987778).

Almost surely, 2^21669925255 is an apocalyptic number.

21669925255 is a deficient number, since it is larger than the sum of its proper divisors (6697976969).

21669925255 is a wasteful number, since it uses less digits than its factorization.

21669925255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393998657.

The product of its digits is 2916000, while the sum is 52.

The spelling of 21669925255 in words is "twenty-one billion, six hundred sixty-nine million, nine hundred twenty-five thousand, two hundred fifty-five".