21126763552 has 24 divisors (see below), whose sum is σ = 43027569900. Its totient is φ = 10199126784.

The previous prime is 21126763547. The next prime is 21126763589. The reversal of 21126763552 is 25536762112.

It can be written as a sum of positive squares in 2 ways, for example, as 20780952336 + 345811216 = 144156^2 + 18596^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11382027 + ... + 11383882.

Almost surely, 2^21126763552 is an apocalyptic number.

It is an amenable number.

21126763552 is an abundant number, since it is smaller than the sum of its proper divisors (21900806348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21126763552 is a wasteful number, since it uses less digits than its factorization.

21126763552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22765948 (or 22765940 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The spelling of 21126763552 in words is "twenty-one billion, one hundred twenty-six million, seven hundred sixty-three thousand, five hundred fifty-two".