1221544353 has 4 divisors (see below), whose sum is σ = 1628725808. Its totient is φ = 814362900.

The previous prime is 1221544339. The next prime is 1221544369. The reversal of 1221544353 is 3534451221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1221544353 - 2⁵ = 1221544321 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 1221544353.

It is not an unprimeable number, because it can be changed into a prime (1221544393) 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, 203590723 + ... + 203590728.

It is an arithmetic number, because the mean of its divisors is an integer number (407181452).

Almost surely, 2^1221544353 is an apocalyptic number.

It is an amenable number.

1221544353 is a deficient number, since it is larger than the sum of its proper divisors (407181455).

1221544353 is an equidigital number, since it uses as much as digits as its factorization.

1221544353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407181454.

The product of its digits is 14400, while the sum is 30.

The square root of 1221544353 is about 34950.5987502360. The cubic root of 1221544353 is about 1068.9804108265.

Adding to 1221544353 its reverse (3534451221), we get a palindrome (4755995574).

The spelling of 1221544353 in words is "one billion, two hundred twenty-one million, five hundred forty-four thousand, three hundred fifty-three".