253411434542221 has 4 divisors (see below), whose sum is σ = 256882824056572. Its totient is φ = 249940045027872.

The previous prime is 253411434542219. The next prime is 253411434542237. The reversal of 253411434542221 is 122245434114352.

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 192445867820196 + 60965566722025 = 13872486^2 + 7808045^2 .

It is a cyclic number.

It is not a de Polignac number, because 253411434542221 - 2¹ = 253411434542219 is a prime.

It is a super-2 number, since 2×253411434542221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253411434542251) 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, 1735694757066 + ... + 1735694757211.

It is an arithmetic number, because the mean of its divisors is an integer number (64220706014143).

Almost surely, 2^{253411434542221} is an apocalyptic number.

It is an amenable number.

253411434542221 is a deficient number, since it is larger than the sum of its proper divisors (3471389514351).

253411434542221 is an equidigital number, since it uses as much as digits as its factorization.

253411434542221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471389514350.

The product of its digits is 921600, while the sum is 43.

Adding to 253411434542221 its reverse (122245434114352), we get a palindrome (375656868656573).

The spelling of 253411434542221 in words is "two hundred fifty-three trillion, four hundred eleven billion, four hundred thirty-four million, five hundred forty-two thousand, two hundred twenty-one".