21255680927 has 8 divisors (see below), whose sum is σ = 22892970576. Its totient is φ = 19618710912.

The previous prime is 21255680921. The next prime is 21255680939. The reversal of 21255680927 is 72908655212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21255680927 - 2⁴ = 21255680911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255680921) 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, 68423 + ... + 217239.

It is an arithmetic number, because the mean of its divisors is an integer number (2861621322).

Almost surely, 2^21255680927 is an apocalyptic number.

21255680927 is a deficient number, since it is larger than the sum of its proper divisors (1637289649).

21255680927 is a wasteful number, since it uses less digits than its factorization.

21255680927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159817.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 21255680927 in words is "twenty-one billion, two hundred fifty-five million, six hundred eighty thousand, nine hundred twenty-seven".