205421053252331 has 4 divisors (see below), whose sum is σ = 234766918002672. Its totient is φ = 176075188501992.

The previous prime is 205421053252313. The next prime is 205421053252333. The reversal of 205421053252331 is 133252350124502.

205421053252331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205421053252331 - 2⁴⁶ = 135052309074667 is a prime.

It is a super-2 number, since 2×205421053252331² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205421053252333) 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, 14672932375160 + ... + 14672932375173.

It is an arithmetic number, because the mean of its divisors is an integer number (58691729500668).

Almost surely, 2^{205421053252331} is an apocalyptic number.

205421053252331 is a deficient number, since it is larger than the sum of its proper divisors (29345864750341).

205421053252331 is an equidigital number, since it uses as much as digits as its factorization.

205421053252331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29345864750340.

The product of its (nonzero) digits is 216000, while the sum is 38.

The spelling of 205421053252331 in words is "two hundred five trillion, four hundred twenty-one billion, fifty-three million, two hundred fifty-two thousand, three hundred thirty-one".