21109566831050 has 12 divisors (see below), whose sum is σ = 39263794305846. Its totient is φ = 8443826732400.

The previous prime is 21109566831013. The next prime is 21109566831053. The reversal of 21109566831050 is 5013866590112.

It can be written as a sum of positive squares in 3 ways, for example, as 19924144540609 + 1185422290441 = 4463647^2 + 1088771^2 .

It is a super-2 number, since 2×21109566831050² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21109566830986 and 21109566831004.

It is not an unprimeable number, because it can be changed into a prime (21109566831053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211095668261 + ... + 211095668360.

Almost surely, 2^{21109566831050} is an apocalyptic number.

21109566831050 is a deficient number, since it is larger than the sum of its proper divisors (18154227474796).

21109566831050 is a wasteful number, since it uses less digits than its factorization.

21109566831050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422191336633 (or 422191336628 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The spelling of 21109566831050 in words is "twenty-one trillion, one hundred nine billion, five hundred sixty-six million, eight hundred thirty-one thousand, fifty".