21236767773 has 16 divisors (see below), whose sum is σ = 31545333120. Its totient is φ = 12618131904.

The previous prime is 21236767751. The next prime is 21236767793. The reversal of 21236767773 is 37776763212.

It is a de Polignac number, because none of the positive numbers 2^k-21236767773 is a prime.

It is a super-3 number, since 3×21236767773³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236767793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9387361 + ... + 9389622.

It is an arithmetic number, because the mean of its divisors is an integer number (1971583320).

Almost surely, 2^21236767773 is an apocalyptic number.

It is an amenable number.

21236767773 is a deficient number, since it is larger than the sum of its proper divisors (10308565347).

21236767773 is a wasteful number, since it uses less digits than its factorization.

21236767773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18777028.

The product of its digits is 3111696, while the sum is 51.

The spelling of 21236767773 in words is "twenty-one billion, two hundred thirty-six million, seven hundred sixty-seven thousand, seven hundred seventy-three".