21032639216425 has 6 divisors (see below), whose sum is σ = 26080472628398. Its totient is φ = 16826111373120.

The previous prime is 21032639216423. The next prime is 21032639216497. The reversal of 21032639216425 is 52461293623012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2698305593104 + 18334333623321 = 1642652^2 + 4281861^2 .

It is not a de Polignac number, because 21032639216425 - 2¹ = 21032639216423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032639216423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 420652784304 + ... + 420652784353.

Almost surely, 2^{21032639216425} is an apocalyptic number.

21032639216425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21032639216425 is a deficient number, since it is larger than the sum of its proper divisors (5047833411973).

21032639216425 is an equidigital number, since it uses as much as digits as its factorization.

21032639216425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841305568667 (or 841305568662 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 21032639216425 in words is "twenty-one trillion, thirty-two billion, six hundred thirty-nine million, two hundred sixteen thousand, four hundred twenty-five".