21194619968 has 28 divisors (see below), whose sum is σ = 43886688960. Its totient is φ = 10136556672.

The previous prime is 21194619959. The next prime is 21194619983. The reversal of 21194619968 is 86991649112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7197788 + ... + 7200731.

Almost surely, 2^21194619968 is an apocalyptic number.

It is an amenable number.

21194619968 is an abundant number, since it is smaller than the sum of its proper divisors (22692068992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21194619968 is a wasteful number, since it uses less digits than its factorization.

21194619968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14398554 (or 14398544 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 56.

The spelling of 21194619968 in words is "twenty-one billion, one hundred ninety-four million, six hundred nineteen thousand, nine hundred sixty-eight".