1221325453 has 6 divisors (see below), whose sum is σ = 1288989294. Its totient is φ = 1157044824.

The previous prime is 1221325433. The next prime is 1221325477. The reversal of 1221325453 is 3545231221.

It can be written as a sum of positive squares in only one way, i.e., 1065500164 + 155825289 = 32642^2 + 12483^2 .

It is not a de Polignac number, because 1221325453 - 2⁵ = 1221325421 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 (1221325433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1691226 + ... + 1691947.

It is an arithmetic number, because the mean of its divisors is an integer number (214831549).

Almost surely, 2^1221325453 is an apocalyptic number.

It is an amenable number.

1221325453 is a deficient number, since it is larger than the sum of its proper divisors (67663841).

1221325453 is an equidigital number, since it uses as much as digits as its factorization.

1221325453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383211 (or 3383192 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 1221325453 is about 34947.4670469835. The cubic root of 1221325453 is about 1068.9165534669.

Adding to 1221325453 its reverse (3545231221), we get a palindrome (4766556674).

The spelling of 1221325453 in words is "one billion, two hundred twenty-one million, three hundred twenty-five thousand, four hundred fifty-three".