253216343021 has 4 divisors (see below), whose sum is σ = 253218614844. Its totient is φ = 253214071200.

The previous prime is 253216342969. The next prime is 253216343033. The reversal of 253216343021 is 120343612352.

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 130891280521 + 122325062500 = 361789^2 + 349750^2 .

It is a cyclic number.

It is not a de Polignac number, because 253216343021 - 2³⁰ = 252142601197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253216343041) 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, 959600 + ... + 1194681.

It is an arithmetic number, because the mean of its divisors is an integer number (63304653711).

Almost surely, 2^253216343021 is an apocalyptic number.

It is an amenable number.

253216343021 is a deficient number, since it is larger than the sum of its proper divisors (2271823).

253216343021 is a wasteful number, since it uses less digits than its factorization.

253216343021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271822.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 253216343021 its reverse (120343612352), we get a palindrome (373559955373).

The spelling of 253216343021 in words is "two hundred fifty-three billion, two hundred sixteen million, three hundred forty-three thousand, twenty-one".