1325201021 has 4 divisors (see below), whose sum is σ = 1325996700. Its totient is φ = 1324405344.

The previous prime is 1325200967. The next prime is 1325201039. The reversal of 1325201021 is 1201025231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 513520921 + 811680100 = 22661^2 + 28490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1325201021 - 2²² = 1321006717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1325201041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395336 + ... + 398673.

It is an arithmetic number, because the mean of its divisors is an integer number (331499175).

Almost surely, 2^1325201021 is an apocalyptic number.

It is an amenable number.

1325201021 is a deficient number, since it is larger than the sum of its proper divisors (795679).

1325201021 is an equidigital number, since it uses as much as digits as its factorization.

1325201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795678.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1325201021 is about 36403.3105774736. The cubic root of 1325201021 is about 1098.4001594431.

Adding to 1325201021 its reverse (1201025231), we get a palindrome (2526226252).

The spelling of 1325201021 in words is "one billion, three hundred twenty-five million, two hundred one thousand, twenty-one".