21126273773 has 16 divisors (see below), whose sum is σ = 23686978560. Its totient is φ = 18679518000.

The previous prime is 21126273757. The next prime is 21126273787. The reversal of 21126273773 is 37737262112.

It is not a de Polignac number, because 21126273773 - 2⁴ = 21126273757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21126273773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126273373) 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, 123203 + ... + 239648.

It is an arithmetic number, because the mean of its divisors is an integer number (1480436160).

Almost surely, 2^21126273773 is an apocalyptic number.

It is an amenable number.

21126273773 is a deficient number, since it is larger than the sum of its proper divisors (2560704787).

21126273773 is a wasteful number, since it uses less digits than its factorization.

21126273773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363008.

The product of its digits is 148176, while the sum is 41.

The spelling of 21126273773 in words is "twenty-one billion, one hundred twenty-six million, two hundred seventy-three thousand, seven hundred seventy-three".