21192571255 has 8 divisors (see below), whose sum is σ = 25910917632. Its totient is φ = 16634168928.

The previous prime is 21192571223. The next prime is 21192571307. The reversal of 21192571255 is 55217529112.

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 21192571255 - 2⁵ = 21192571223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39985719 + ... + 39986248.

It is an arithmetic number, because the mean of its divisors is an integer number (3238864704).

Almost surely, 2^21192571255 is an apocalyptic number.

21192571255 is a deficient number, since it is larger than the sum of its proper divisors (4718346377).

21192571255 is an equidigital number, since it uses as much as digits as its factorization.

21192571255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79972025.

The product of its digits is 63000, while the sum is 40.

The spelling of 21192571255 in words is "twenty-one billion, one hundred ninety-two million, five hundred seventy-one thousand, two hundred fifty-five".