21134561255 has 16 divisors (see below), whose sum is σ = 25576694784. Its totient is φ = 16764654240.

The previous prime is 21134561197. The next prime is 21134561263. The reversal of 21134561255 is 55216543112.

It is not a de Polignac number, because 21134561255 - 2¹² = 21134557159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321182 + ... + 381348.

It is an arithmetic number, because the mean of its divisors is an integer number (1598543424).

Almost surely, 2^21134561255 is an apocalyptic number.

21134561255 is a deficient number, since it is larger than the sum of its proper divisors (4442133529).

21134561255 is a wasteful number, since it uses less digits than its factorization.

21134561255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60766.

The product of its digits is 36000, while the sum is 35.

The spelling of 21134561255 in words is "twenty-one billion, one hundred thirty-four million, five hundred sixty-one thousand, two hundred fifty-five".