21986473161 has 16 divisors (see below), whose sum is σ = 29834300160. Its totient is φ = 14400121680.

The previous prime is 21986473109. The next prime is 21986473189. The reversal of 21986473161 is 16137468912.

It is not a de Polignac number, because 21986473161 - 2⁶ = 21986473097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21986473161.

It is not an unprimeable number, because it can be changed into a prime (21986473661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202075 + ... + 291216.

It is an arithmetic number, because the mean of its divisors is an integer number (1864643760).

Almost surely, 2^21986473161 is an apocalyptic number.

It is an amenable number.

21986473161 is a deficient number, since it is larger than the sum of its proper divisors (7847826999).

21986473161 is a wasteful number, since it uses less digits than its factorization.

21986473161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493556.

The product of its digits is 435456, while the sum is 48.

The spelling of 21986473161 in words is "twenty-one billion, nine hundred eighty-six million, four hundred seventy-three thousand, one hundred sixty-one".