21255456115 has 8 divisors (see below), whose sum is σ = 25512052320. Its totient is φ = 17000694912.

The previous prime is 21255456113. The next prime is 21255456151. The reversal of 21255456115 is 51165455212.

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 21255456115 - 2¹ = 21255456113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21255456113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433135 + ... + 479704.

It is an arithmetic number, because the mean of its divisors is an integer number (3189006540).

Almost surely, 2^21255456115 is an apocalyptic number.

21255456115 is a deficient number, since it is larger than the sum of its proper divisors (4256596205).

21255456115 is an equidigital number, since it uses as much as digits as its factorization.

21255456115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917501.

The product of its digits is 60000, while the sum is 37.

The spelling of 21255456115 in words is "twenty-one billion, two hundred fifty-five million, four hundred fifty-six thousand, one hundred fifteen".