21885101631893 has 8 divisors (see below), whose sum is σ = 22019965463448. Its totient is φ = 21750333896704.

The previous prime is 21885101631851. The next prime is 21885101632013. The reversal of 21885101631893 is 39813610158812.

It can be written as a sum of positive squares in 4 ways, for example, as 700088644369 + 21185012987524 = 836713^2 + 4602718^2 .

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 21885101631893 - 2¹⁰ = 21885101630869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21885101631803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23567180 + ... + 24478197.

It is an arithmetic number, because the mean of its divisors is an integer number (2752495682931).

Almost surely, 2^{21885101631893} is an apocalyptic number.

It is an amenable number.

21885101631893 is a deficient number, since it is larger than the sum of its proper divisors (134863831555).

21885101631893 is a wasteful number, since it uses less digits than its factorization.

21885101631893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48048183.

The product of its (nonzero) digits is 2488320, while the sum is 56.

The spelling of 21885101631893 in words is "twenty-one trillion, eight hundred eighty-five billion, one hundred one million, six hundred thirty-one thousand, eight hundred ninety-three".