21443513552425 has 12 divisors (see below), whose sum is σ = 26864080074076. Its totient is φ = 16977957120000.

The previous prime is 21443513552413. The next prime is 21443513552441. The reversal of 21443513552425 is 52425531534412.

It can be written as a sum of positive squares in 6 ways, for example, as 1596738031641 + 19846775520784 = 1263621^2 + 4454972^2 .

It is not a de Polignac number, because 21443513552425 - 2¹¹ = 21443513550377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4421340576 + ... + 4421345425.

Almost surely, 2^{21443513552425} is an apocalyptic number.

21443513552425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21443513552425 is a deficient number, since it is larger than the sum of its proper divisors (5420566521651).

21443513552425 is an equidigital number, since it uses as much as digits as its factorization.

21443513552425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8842686108 (or 8842686103 counting only the distinct ones).

The product of its digits is 2880000, while the sum is 46.

The spelling of 21443513552425 in words is "twenty-one trillion, four hundred forty-three billion, five hundred thirteen million, five hundred fifty-two thousand, four hundred twenty-five".