21426235225 has 12 divisors (see below), whose sum is σ = 26669560896. Its totient is φ = 17075808080.

The previous prime is 21426235219. The next prime is 21426235247. The reversal of 21426235225 is 52253262412.

It is not a de Polignac number, because 21426235225 - 2¹³ = 21426227033 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, 1622797 + ... + 1635946.

It is an arithmetic number, because the mean of its divisors is an integer number (2222463408).

Almost surely, 2^21426235225 is an apocalyptic number.

21426235225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21426235225 is a deficient number, since it is larger than the sum of its proper divisors (5243325671).

21426235225 is a wasteful number, since it uses less digits than its factorization.

21426235225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259016 (or 3259011 counting only the distinct ones).

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

Adding to 21426235225 its reverse (52253262412), we get a palindrome (73679497637).

The spelling of 21426235225 in words is "twenty-one billion, four hundred twenty-six million, two hundred thirty-five thousand, two hundred twenty-five".