1253453244521 has 4 divisors (see below), whose sum is σ = 1260698639172. Its totient is φ = 1246207849872.

The previous prime is 1253453244503. The next prime is 1253453244523. The reversal of 1253453244521 is 1254423543521.

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 677123265625 + 576329978896 = 822875^2 + 759164^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253453244521 - 2³⁸ = 978575337577 is a prime.

It is a super-2 number, since 2×1253453244521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1253453244523) 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, 3622697066 + ... + 3622697411.

It is an arithmetic number, because the mean of its divisors is an integer number (315174659793).

Almost surely, 2^{1253453244521} is an apocalyptic number.

It is an amenable number.

1253453244521 is a deficient number, since it is larger than the sum of its proper divisors (7245394651).

1253453244521 is an equidigital number, since it uses as much as digits as its factorization.

1253453244521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7245394650.

The product of its digits is 576000, while the sum is 41.

Subtracting 1253453244521 from its reverse (1254423543521), we obtain a cube (970299000 = 990³).

The spelling of 1253453244521 in words is "one trillion, two hundred fifty-three billion, four hundred fifty-three million, two hundred forty-four thousand, five hundred twenty-one".