253442442521 has 4 divisors (see below), whose sum is σ = 257738077200. Its totient is φ = 249146807844.

The previous prime is 253442442511. The next prime is 253442442523. The reversal of 253442442521 is 125244244352.

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 253442442521 - 2¹⁸ = 253442180377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253442442523) 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, 2147817251 + ... + 2147817368.

It is an arithmetic number, because the mean of its divisors is an integer number (64434519300).

Almost surely, 2^253442442521 is an apocalyptic number.

It is an amenable number.

253442442521 is a deficient number, since it is larger than the sum of its proper divisors (4295634679).

253442442521 is an equidigital number, since it uses as much as digits as its factorization.

253442442521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4295634678.

The product of its digits is 307200, while the sum is 38.

Adding to 253442442521 its reverse (125244244352), we get a palindrome (378686686873).

The spelling of 253442442521 in words is "two hundred fifty-three billion, four hundred forty-two million, four hundred forty-two thousand, five hundred twenty-one".