21122225425 has 36 divisors (see below), whose sum is σ = 32071332720. Its totient is φ = 13721490720.

The previous prime is 21122225419. The next prime is 21122225431. The reversal of 21122225425 is 52452222112.

It is an interprime number because it is at equal distance from previous prime (21122225419) and next prime (21122225431).

It is not a de Polignac number, because 21122225425 - 2²¹ = 21120128273 is a prime.

It is a super-2 number, since 2×21122225425² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122225393 and 21122225402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 430479 + ... + 477028.

Almost surely, 2^21122225425 is an apocalyptic number.

21122225425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21122225425 is a deficient number, since it is larger than the sum of its proper divisors (10949107295).

21122225425 is a wasteful number, since it uses less digits than its factorization.

21122225425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907550 (or 907538 counting only the distinct ones).

The product of its digits is 6400, while the sum is 28.

Adding to 21122225425 its reverse (52452222112), we get a palindrome (73574447537).

The spelling of 21122225425 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-five thousand, four hundred twenty-five".