21975785092 has 24 divisors (see below), whose sum is σ = 41145352640. Its totient is φ = 10238931360.

The previous prime is 21975785087. The next prime is 21975785093. The reversal of 21975785092 is 29058757912.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21975785093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2365488 + ... + 2374759.

Almost surely, 2^21975785092 is an apocalyptic number.

It is an amenable number.

21975785092 is a deficient number, since it is larger than the sum of its proper divisors (19169567548).

21975785092 is a wasteful number, since it uses less digits than its factorization.

21975785092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4740331 (or 4740329 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 21975785092 in words is "twenty-one billion, nine hundred seventy-five million, seven hundred eighty-five thousand, ninety-two".