1253105421 has 4 divisors (see below), whose sum is σ = 1670807232. Its totient is φ = 835403612.

The previous prime is 1253105417. The next prime is 1253105429. The reversal of 1253105421 is 1245013521.

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.

It is a cyclic number.

It is not a de Polignac number, because 1253105421 - 2² = 1253105417 is a prime.

It is a super-2 number, since 2×1253105421² = 3140546392279174482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1253105391 and 1253105400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253105429) 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, 208850901 + ... + 208850906.

It is an arithmetic number, because the mean of its divisors is an integer number (417701808).

Almost surely, 2^1253105421 is an apocalyptic number.

It is an amenable number.

1253105421 is a deficient number, since it is larger than the sum of its proper divisors (417701811).

1253105421 is an equidigital number, since it uses as much as digits as its factorization.

1253105421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417701810.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1253105421 is about 35399.2291017756. The cubic root of 1253105421 is about 1078.1086642078.

Adding to 1253105421 its reverse (1245013521), we get a palindrome (2498118942).

The spelling of 1253105421 in words is "one billion, two hundred fifty-three million, one hundred five thousand, four hundred twenty-one".