253205133221 has 12 divisors (see below), whose sum is σ = 268040595744. Its totient is φ = 239153725800.

The previous prime is 253205133163. The next prime is 253205133229. The reversal of 253205133221 is 122331502352.

It is a de Polignac number, because none of the positive numbers 2^k-253205133221 is a prime.

It is a super-2 number, since 2×253205133221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253205133229) 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 11 ways as a sum of consecutive naturals, for example, 940025 + ... + 1179006.

It is an arithmetic number, because the mean of its divisors is an integer number (22336716312).

Almost surely, 2^253205133221 is an apocalyptic number.

It is an amenable number.

253205133221 is a deficient number, since it is larger than the sum of its proper divisors (14835462523).

253205133221 is a wasteful number, since it uses less digits than its factorization.

253205133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119400 (or 2119381 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 253205133221 its reverse (122331502352), we get a palindrome (375536635573).

The spelling of 253205133221 in words is "two hundred fifty-three billion, two hundred five million, one hundred thirty-three thousand, two hundred twenty-one".