21246035425 has 6 divisors (see below), whose sum is σ = 26345083958. Its totient is φ = 16996828320.

The previous prime is 21246035347. The next prime is 21246035471. The reversal of 21246035425 is 52453064212.

It can be written as a sum of positive squares in 3 ways, for example, as 2719831104 + 18526204321 = 52152^2 + 136111^2 .

It is not a de Polignac number, because 21246035425 - 2⁹ = 21246034913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 424920684 + ... + 424920733.

Almost surely, 2^21246035425 is an apocalyptic number.

21246035425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21246035425 is a deficient number, since it is larger than the sum of its proper divisors (5099048533).

21246035425 is an equidigital number, since it uses as much as digits as its factorization.

21246035425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849841427 (or 849841422 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 21246035425 its reverse (52453064212), we get a palindrome (73699099637).

The spelling of 21246035425 in words is "twenty-one billion, two hundred forty-six million, thirty-five thousand, four hundred twenty-five".