21163754255 has 8 divisors (see below), whose sum is σ = 29024577312. Its totient is φ = 14512288608.

The previous prime is 21163754203. The next prime is 21163754303. The reversal of 21163754255 is 55245736112.

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 21163754255 - 2²² = 21159559951 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302339312 + ... + 302339381.

It is an arithmetic number, because the mean of its divisors is an integer number (3628072164).

Almost surely, 2^21163754255 is an apocalyptic number.

21163754255 is a deficient number, since it is larger than the sum of its proper divisors (7860823057).

21163754255 is an equidigital number, since it uses as much as digits as its factorization.

21163754255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604678705.

The product of its digits is 252000, while the sum is 41.

The spelling of 21163754255 in words is "twenty-one billion, one hundred sixty-three million, seven hundred fifty-four thousand, two hundred fifty-five".