22121351225 has 12 divisors (see below), whose sum is σ = 28315330560. Its totient is φ = 17126206800.

The previous prime is 22121351221. The next prime is 22121351249. The reversal of 22121351225 is 52215312122.

It is a happy number.

It is not a de Polignac number, because 22121351225 - 2² = 22121351221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121351194 and 22121351203.

It is not an unprimeable number, because it can be changed into a prime (22121351221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14271065 + ... + 14272614.

It is an arithmetic number, because the mean of its divisors is an integer number (2359610880).

Almost surely, 2^22121351225 is an apocalyptic number.

22121351225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22121351225 is a deficient number, since it is larger than the sum of its proper divisors (6193979335).

22121351225 is a wasteful number, since it uses less digits than its factorization.

22121351225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28543720 (or 28543715 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

Adding to 22121351225 its reverse (52215312122), we get a palindrome (74336663347).

The spelling of 22121351225 in words is "twenty-two billion, one hundred twenty-one million, three hundred fifty-one thousand, two hundred twenty-five".