1212121325 has 6 divisors (see below), whose sum is σ = 1503030474. Its totient is φ = 969697040.

The previous prime is 1212121307. The next prime is 1212121331. The reversal of 1212121325 is 5231212121.

It can be written as a sum of positive squares in 3 ways, for example, as 19731364 + 1192389961 = 4442^2 + 34531^2 .

It is not a de Polignac number, because 1212121325 - 2⁸ = 1212121069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212121297 and 1212121306.

It is a congruent 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, 24242402 + ... + 24242451.

It is an arithmetic number, because the mean of its divisors is an integer number (250505079).

Almost surely, 2^1212121325 is an apocalyptic number.

It is an amenable number.

1212121325 is a deficient number, since it is larger than the sum of its proper divisors (290909149).

1212121325 is an equidigital number, since it uses as much as digits as its factorization.

1212121325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48484863 (or 48484858 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 1212121325 is about 34815.5328122377. The cubic root of 1212121325 is about 1066.2245973588.

Adding to 1212121325 its reverse (5231212121), we get a palindrome (6443333446).

The spelling of 1212121325 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, three hundred twenty-five".