21909002776 has 32 divisors (see below), whose sum is σ = 41819888880. Its totient is φ = 10758758400.

The previous prime is 21909002749. The next prime is 21909002779. The reversal of 21909002776 is 67720090912.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21909002779) 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, 6105 + ... + 209416.

Almost surely, 2^21909002776 is an apocalyptic number.

It is an amenable number.

21909002776 is a deficient number, since it is larger than the sum of its proper divisors (19910886104).

21909002776 is a wasteful number, since it uses less digits than its factorization.

21909002776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215755 (or 215751 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 43.

The spelling of 21909002776 in words is "twenty-one billion, nine hundred nine million, two thousand, seven hundred seventy-six".