21375937773 has 8 divisors (see below), whose sum is σ = 31668056000. Its totient is φ = 14250625164.

The previous prime is 21375937771. The next prime is 21375937799. The reversal of 21375937773 is 37773957312.

21375937773 is a `hidden beast` number, since 213 + 7 + 59 + 377 + 7 + 3 = 666.

It is not a de Polignac number, because 21375937773 - 2¹ = 21375937771 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 (21375937771) 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, 395850673 + ... + 395850726.

It is an arithmetic number, because the mean of its divisors is an integer number (3958507000).

Almost surely, 2^21375937773 is an apocalyptic number.

It is an amenable number.

21375937773 is a deficient number, since it is larger than the sum of its proper divisors (10292118227).

21375937773 is an equidigital number, since it uses as much as digits as its factorization.

21375937773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791701408 (or 791701402 counting only the distinct ones).

The product of its digits is 5834430, while the sum is 54.

The spelling of 21375937773 in words is "twenty-one billion, three hundred seventy-five million, nine hundred thirty-seven thousand, seven hundred seventy-three".