21272968773 has 24 divisors (see below), whose sum is σ = 35692981376. Its totient is φ = 11956701600.

The previous prime is 21272968741. The next prime is 21272968781. The reversal of 21272968773 is 37786927212.

It is not a de Polignac number, because 21272968773 - 2⁵ = 21272968741 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 (21272968723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2763913 + ... + 2771598.

Almost surely, 2^21272968773 is an apocalyptic number.

It is an amenable number.

21272968773 is a deficient number, since it is larger than the sum of its proper divisors (14420012603).

21272968773 is a wasteful number, since it uses less digits than its factorization.

21272968773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5535585 (or 5535582 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The spelling of 21272968773 in words is "twenty-one billion, two hundred seventy-two million, nine hundred sixty-eight thousand, seven hundred seventy-three".