1321420025 has 12 divisors (see below), whose sum is σ = 1640582124. Its totient is φ = 1055832000.

The previous prime is 1321420007. The next prime is 1321420027. The reversal of 1321420025 is 5200241231.

It can be written as a sum of positive squares in 6 ways, for example, as 22250089 + 1299169936 = 4717^2 + 36044^2 .

It is not a de Polignac number, because 1321420025 - 2²⁰ = 1320371449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321419979 and 1321420006.

It is not an unprimeable number, because it can be changed into a prime (1321420027) 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, 11666 + ... + 52715.

It is an arithmetic number, because the mean of its divisors is an integer number (136715177).

Almost surely, 2^1321420025 is an apocalyptic number.

It is an amenable number.

1321420025 is a deficient number, since it is larger than the sum of its proper divisors (319162099).

1321420025 is an equidigital number, since it uses as much as digits as its factorization.

1321420025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65212 (or 65207 counting only the distinct ones).

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

The square root of 1321420025 is about 36351.3414470498. The cubic root of 1321420025 is about 1097.3545312529.

Adding to 1321420025 its reverse (5200241231), we get a palindrome (6521661256).

The spelling of 1321420025 in words is "one billion, three hundred twenty-one million, four hundred twenty thousand, twenty-five".