1213220225 has 24 divisors (see below), whose sum is σ = 1737055488. Its totient is φ = 823334400.

The previous prime is 1213220219. The next prime is 1213220273. The reversal of 1213220225 is 5220223121.

1213220225 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1213220225 - 2⁴ = 1213220209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213220197 and 1213220206.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18761 + ... + 52710.

It is an arithmetic number, because the mean of its divisors is an integer number (72377312).

Almost surely, 2^1213220225 is an apocalyptic number.

It is an amenable number.

1213220225 is a deficient number, since it is larger than the sum of its proper divisors (523835263).

1213220225 is an equidigital number, since it uses as much as digits as its factorization.

1213220225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71585 (or 71580 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1213220225 is about 34831.3109859506. The cubic root of 1213220225 is about 1066.5467104144.

Adding to 1213220225 its reverse (5220223121), we get a palindrome (6433443346).

The spelling of 1213220225 in words is "one billion, two hundred thirteen million, two hundred twenty thousand, two hundred twenty-five".