253005540145221 has 4 divisors (see below), whose sum is σ = 337340720193632. Its totient is φ = 168670360096812.

The previous prime is 253005540145177. The next prime is 253005540145223. The reversal of 253005540145221 is 122541045500352.

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 not a de Polignac number, because 253005540145221 - 2⁶ = 253005540145157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 253005540145221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253005540145223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42167590024201 + ... + 42167590024206.

It is an arithmetic number, because the mean of its divisors is an integer number (84335180048408).

Almost surely, 2^{253005540145221} is an apocalyptic number.

It is an amenable number.

253005540145221 is a deficient number, since it is larger than the sum of its proper divisors (84335180048411).

253005540145221 is an equidigital number, since it uses as much as digits as its factorization.

253005540145221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84335180048410.

The product of its (nonzero) digits is 240000, while the sum is 39.

Adding to 253005540145221 its reverse (122541045500352), we get a palindrome (375546585645573).

The spelling of 253005540145221 in words is "two hundred fifty-three trillion, five billion, five hundred forty million, one hundred forty-five thousand, two hundred twenty-one".