22121425 has 6 divisors (see below), whose sum is σ = 27430598. Its totient is φ = 17697120.

The previous prime is 22121387. The next prime is 22121431. The reversal of 22121425 is 52412122.

It can be written as a sum of positive squares in 3 ways, for example, as 6723649 + 15397776 = 2593^2 + 3924^2 .

It is not a de Polignac number, because 22121425 - 2⁹ = 22120913 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, 442404 + ... + 442453.

Almost surely, 2^22121425 is an apocalyptic number.

22121425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22121425 is a deficient number, since it is larger than the sum of its proper divisors (5309173).

22121425 is an equidigital number, since it uses as much as digits as its factorization.

22121425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884867 (or 884862 counting only the distinct ones).

The product of its digits is 320, while the sum is 19.

The square root of 22121425 is about 4703.3418969920. The cubic root of 22121425 is about 280.7184990931.

Adding to 22121425 its reverse (52412122), we get a palindrome (74533547).

The spelling of 22121425 in words is "twenty-two million, one hundred twenty-one thousand, four hundred twenty-five".