21126444277572 has 72 divisors (see below), whose sum is σ = 53776052530200. Its totient is φ = 6992974425600.

The previous prime is 21126444277553. The next prime is 21126444277579. The reversal of 21126444277572 is 27577244462112.

21126444277572 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 6 + 4 + 44 + 27 + 7 + 572 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1879131022596 + 19247313254976 = 1370814^2 + 4387176^2 .

It is not an unprimeable number, because it can be changed into a prime (21126444277579) 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, 19165822 + ... + 20238122.

It is an arithmetic number, because the mean of its divisors is an integer number (746889618475).

Almost surely, 2^{21126444277572} is an apocalyptic number.

It is an amenable number.

21126444277572 is an abundant number, since it is smaller than the sum of its proper divisors (32649608252628).

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

21126444277572 is a wasteful number, since it uses less digits than its factorization.

21126444277572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076133 (or 1076128 counting only the distinct ones).

The product of its digits is 10536960, while the sum is 54.

The spelling of 21126444277572 in words is "twenty-one trillion, one hundred twenty-six billion, four hundred forty-four million, two hundred seventy-seven thousand, five hundred seventy-two".