21964446171 has 6 divisors (see below), whose sum is σ = 31726422260. Its totient is φ = 14642964108.

The previous prime is 21964446169. The next prime is 21964446181. The reversal of 21964446171 is 17164446912.

21964446171 is a `hidden beast` number, since 2 + 196 + 4 + 446 + 17 + 1 = 666.

It is not a de Polignac number, because 21964446171 - 2¹ = 21964446169 is a prime.

It is a super-2 number, since 2×21964446171² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21964446181) 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, 1220247001 + ... + 1220247018.

Almost surely, 2^21964446171 is an apocalyptic number.

21964446171 is a deficient number, since it is larger than the sum of its proper divisors (9761976089).

21964446171 is a wasteful number, since it uses less digits than its factorization.

21964446171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440494025 (or 2440494022 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The spelling of 21964446171 in words is "twenty-one billion, nine hundred sixty-four million, four hundred forty-six thousand, one hundred seventy-one".