1153204421 has 4 divisors (see below), whose sum is σ = 1154630700. Its totient is φ = 1151778144.

The previous prime is 1153204391. The next prime is 1153204427. The reversal of 1153204421 is 1244023511.

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 974313796 + 178890625 = 31214^2 + 13375^2 .

It is a cyclic number.

It is not a de Polignac number, because 1153204421 - 2⁶ = 1153204357 is a prime.

It is a super-2 number, since 2×1153204421² = 2659760873227890482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153204427) 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, 711926 + ... + 713543.

It is an arithmetic number, because the mean of its divisors is an integer number (288657675).

Almost surely, 2^1153204421 is an apocalyptic number.

It is an amenable number.

1153204421 is a deficient number, since it is larger than the sum of its proper divisors (1426279).

1153204421 is an equidigital number, since it uses as much as digits as its factorization.

1153204421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426278.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1153204421 is about 33958.8636588447. The cubic root of 1153204421 is about 1048.6617633054.

Adding to 1153204421 its reverse (1244023511), we get a palindrome (2397227932).

The spelling of 1153204421 in words is "one billion, one hundred fifty-three million, two hundred four thousand, four hundred twenty-one".