1222221425 has 12 divisors (see below), whose sum is σ = 1532586060. Its totient is φ = 966789120.

The previous prime is 1222221421. The next prime is 1222221431. The reversal of 1222221425 is 5241222221.

It can be written as a sum of positive squares in 6 ways, for example, as 82011136 + 1140210289 = 9056^2 + 33767^2 .

It is not a de Polignac number, because 1222221425 - 2² = 1222221421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222221425.

It is not an unprimeable number, because it can be changed into a prime (1222221421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 272432 + ... + 276881.

It is an arithmetic number, because the mean of its divisors is an integer number (127715505).

Almost surely, 2^1222221425 is an apocalyptic number.

It is an amenable number.

1222221425 is a deficient number, since it is larger than the sum of its proper divisors (310364635).

1222221425 is an equidigital number, since it uses as much as digits as its factorization.

1222221425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549412 (or 549407 counting only the distinct ones).

The product of its digits is 1280, while the sum is 23.

The square root of 1222221425 is about 34960.2835371797. The cubic root of 1222221425 is about 1069.1778775333.

Adding to 1222221425 its reverse (5241222221), we get a palindrome (6463443646).

The spelling of 1222221425 in words is "one billion, two hundred twenty-two million, two hundred twenty-one thousand, four hundred twenty-five".