21985095167 has 4 divisors (see below), whose sum is σ = 25125823056. Its totient is φ = 18844367280.

The previous prime is 21985095163. The next prime is 21985095221. The reversal of 21985095167 is 76159058912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21985095167 - 2² = 21985095163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21985095161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1570363934 + ... + 1570363947.

It is an arithmetic number, because the mean of its divisors is an integer number (6281455764).

Almost surely, 2^21985095167 is an apocalyptic number.

21985095167 is a deficient number, since it is larger than the sum of its proper divisors (3140727889).

21985095167 is an equidigital number, since it uses as much as digits as its factorization.

21985095167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140727888.

The product of its (nonzero) digits is 1360800, while the sum is 53.

The spelling of 21985095167 in words is "twenty-one billion, nine hundred eighty-five million, ninety-five thousand, one hundred sixty-seven".