21919069161 has 48 divisors (see below), whose sum is σ = 37937802240. Its totient is φ = 12037908960.

The previous prime is 21919069147. The next prime is 21919069189. The reversal of 21919069161 is 16196091912.

It is not a de Polignac number, because 21919069161 - 2⁵ = 21919069129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21919069961) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 210061 + ... + 296586.

It is an arithmetic number, because the mean of its divisors is an integer number (790370880).

Almost surely, 2^21919069161 is an apocalyptic number.

It is an amenable number.

21919069161 is a deficient number, since it is larger than the sum of its proper divisors (16018733079).

21919069161 is a wasteful number, since it uses less digits than its factorization.

21919069161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506706 (or 506703 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The spelling of 21919069161 in words is "twenty-one billion, nine hundred nineteen million, sixty-nine thousand, one hundred sixty-one".