21939609255 has 8 divisors (see below), whose sum is σ = 35103374832. Its totient is φ = 11701124928.

The previous prime is 21939609217. The next prime is 21939609257. The reversal of 21939609255 is 55290693912.

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

It is not a de Polignac number, because 21939609255 - 2⁶ = 21939609191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21939609198 and 21939609207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21939609257) 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, 731320294 + ... + 731320323.

It is an arithmetic number, because the mean of its divisors is an integer number (4387921854).

Almost surely, 2^21939609255 is an apocalyptic number.

21939609255 is a deficient number, since it is larger than the sum of its proper divisors (13163765577).

21939609255 is a wasteful number, since it uses less digits than its factorization.

21939609255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462640625.

The product of its (nonzero) digits is 1312200, while the sum is 51.

The spelling of 21939609255 in words is "twenty-one billion, nine hundred thirty-nine million, six hundred nine thousand, two hundred fifty-five".