21194619967 has 16 divisors (see below), whose sum is σ = 23010365952. Its totient is φ = 19445488000.

The previous prime is 21194619959. The next prime is 21194619983. The reversal of 21194619967 is 76991649112.

It is a cyclic number.

It is not a de Polignac number, because 21194619967 - 2³ = 21194619959 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 (21194619067) 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, 147708 + ... + 253390.

It is an arithmetic number, because the mean of its divisors is an integer number (1438147872).

Almost surely, 2^21194619967 is an apocalyptic number.

21194619967 is a deficient number, since it is larger than the sum of its proper divisors (1815745985).

21194619967 is a wasteful number, since it uses less digits than its factorization.

21194619967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105998.

The product of its digits is 1469664, while the sum is 55.

The spelling of 21194619967 in words is "twenty-one billion, one hundred ninety-four million, six hundred nineteen thousand, nine hundred sixty-seven".