831140199221 has 2 divisors, whose sum is σ = 831140199222. Its totient is φ = 831140199220.

The previous prime is 831140199217. The next prime is 831140199283. The reversal of 831140199221 is 122991041138.

It is a happy number.

831140199221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 807192636721 + 23947562500 = 898439^2 + 154750^2 .

It is a cyclic number.

It is not a de Polignac number, because 831140199221 - 2² = 831140199217 is a prime.

It is a super-2 number, since 2×831140199221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (831140189221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415570099610 + 415570099611.

It is an arithmetic number, because the mean of its divisors is an integer number (415570099611).

Almost surely, 2^831140199221 is an apocalyptic number.

It is an amenable number.

831140199221 is a deficient number, since it is larger than the sum of its proper divisors (1).

831140199221 is an equidigital number, since it uses as much as digits as its factorization.

831140199221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The spelling of 831140199221 in words is "eight hundred thirty-one billion, one hundred forty million, one hundred ninety-nine thousand, two hundred twenty-one".