21899774895 has 16 divisors (see below), whose sum is σ = 35274808800. Its totient is φ = 11601490304.

The previous prime is 21899774893. The next prime is 21899774899. The reversal of 21899774895 is 59847799812.

It is a cyclic number.

It is not a de Polignac number, because 21899774895 - 2¹ = 21899774893 is a prime.

It is a super-2 number, since 2×21899774895² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21899774893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4897044 + ... + 4901513.

It is an arithmetic number, because the mean of its divisors is an integer number (2204675550).

Almost surely, 2^21899774895 is an apocalyptic number.

21899774895 is a deficient number, since it is larger than the sum of its proper divisors (13375033905).

21899774895 is a wasteful number, since it uses less digits than its factorization.

21899774895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9798714.

The product of its digits is 91445760, while the sum is 69.

The spelling of 21899774895 in words is "twenty-one billion, eight hundred ninety-nine million, seven hundred seventy-four thousand, eight hundred ninety-five".