1153305421 has 4 divisors (see below), whose sum is σ = 1153373344. Its totient is φ = 1153237500.

The previous prime is 1153305407. The next prime is 1153305427. The reversal of 1153305421 is 1245033511.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1245033511 = 41 ⋅30366671.

It is a cyclic number.

It is not a de Polignac number, because 1153305421 - 2⁵ = 1153305389 is a prime.

It is a super-3 number, since 3×1153305421³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153305427) 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, 16666 + ... + 50836.

It is an arithmetic number, because the mean of its divisors is an integer number (288343336).

Almost surely, 2^1153305421 is an apocalyptic number.

It is an amenable number.

1153305421 is a deficient number, since it is larger than the sum of its proper divisors (67923).

1153305421 is an equidigital number, since it uses as much as digits as its factorization.

1153305421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67922.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1153305421 is about 33960.3507196260. The cubic root of 1153305421 is about 1048.6923770585.

Adding to 1153305421 its reverse (1245033511), we get a palindrome (2398338932).

The spelling of 1153305421 in words is "one billion, one hundred fifty-three million, three hundred five thousand, four hundred twenty-one".