21134127785 has 16 divisors (see below), whose sum is σ = 26905958400. Its totient is φ = 15891313536.

The previous prime is 21134127713. The next prime is 21134127799. The reversal of 21134127785 is 58772143112.

It is a cyclic number.

It is not a de Polignac number, because 21134127785 - 2¹⁶ = 21134062249 is a prime.

It is a Curzon 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, 863780 + ... + 887909.

It is an arithmetic number, because the mean of its divisors is an integer number (1681622400).

Almost surely, 2^21134127785 is an apocalyptic number.

It is an amenable number.

21134127785 is a deficient number, since it is larger than the sum of its proper divisors (5771830615).

21134127785 is a wasteful number, since it uses less digits than its factorization.

21134127785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751840.

The product of its digits is 94080, while the sum is 41.

The spelling of 21134127785 in words is "twenty-one billion, one hundred thirty-four million, one hundred twenty-seven thousand, seven hundred eighty-five".