1321454521 has 4 divisors (see below), whose sum is σ = 1323610852. Its totient is φ = 1319298192.

The previous prime is 1321454483. The next prime is 1321454531. The reversal of 1321454521 is 1254541231.

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 625550121 + 695904400 = 25011^2 + 26380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321454521 - 2¹⁵ = 1321421753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321454521.

It is not an unprimeable number, because it can be changed into a prime (1321454531) 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, 1077246 + ... + 1078471.

It is an arithmetic number, because the mean of its divisors is an integer number (330902713).

Almost surely, 2^1321454521 is an apocalyptic number.

It is an amenable number.

1321454521 is a deficient number, since it is larger than the sum of its proper divisors (2156331).

1321454521 is an equidigital number, since it uses as much as digits as its factorization.

1321454521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156330.

The product of its digits is 4800, while the sum is 28.

The square root of 1321454521 is about 36351.8159243799. The cubic root of 1321454521 is about 1097.3640800746.

Adding to 1321454521 its reverse (1254541231), we get a palindrome (2575995752).

The spelling of 1321454521 in words is "one billion, three hundred twenty-one million, four hundred fifty-four thousand, five hundred twenty-one".