253105830821 has 4 divisors (see below), whose sum is σ = 258491061312. Its totient is φ = 247720600332.

The previous prime is 253105830767. The next prime is 253105830829. The reversal of 253105830821 is 128038501352.

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 a de Polignac number, because none of the positive numbers 2^k-253105830821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253105830829) 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, 2692615175 + ... + 2692615268.

It is an arithmetic number, because the mean of its divisors is an integer number (64622765328).

Almost surely, 2^253105830821 is an apocalyptic number.

It is an amenable number.

253105830821 is a deficient number, since it is larger than the sum of its proper divisors (5385230491).

253105830821 is an equidigital number, since it uses as much as digits as its factorization.

253105830821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5385230490.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 253105830821 in words is "two hundred fifty-three billion, one hundred five million, eight hundred thirty thousand, eight hundred twenty-one".