21126444325 has 36 divisors (see below), whose sum is σ = 30551281572. Its totient is φ = 14449881600.

The previous prime is 21126444319. The next prime is 21126444329. The reversal of 21126444325 is 52344462112.

It can be written as a sum of positive squares in 6 ways, for example, as 417507489 + 20708936836 = 20433^2 + 143906^2 .

It is not a de Polignac number, because 21126444325 - 2¹⁹ = 21125920037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126444329) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 464605 + ... + 508045.

Almost surely, 2^21126444325 is an apocalyptic number.

21126444325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21126444325 is a deficient number, since it is larger than the sum of its proper divisors (9424837247).

21126444325 is a wasteful number, since it uses less digits than its factorization.

21126444325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43862 (or 43850 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The spelling of 21126444325 in words is "twenty-one billion, one hundred twenty-six million, four hundred forty-four thousand, three hundred twenty-five".