231267963821 has 2 divisors, whose sum is σ = 231267963822. Its totient is φ = 231267963820.

The previous prime is 231267963809. The next prime is 231267963877. The reversal of 231267963821 is 128369762132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186032629225 + 45235334596 = 431315^2 + 212686^2 .

It is a cyclic number.

It is not a de Polignac number, because 231267963821 - 2³⁴ = 214088094637 is a prime.

It is a super-2 number, since 2×231267963821² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231267963821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231267963221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115633981910 + 115633981911.

It is an arithmetic number, because the mean of its divisors is an integer number (115633981911).

Almost surely, 2^231267963821 is an apocalyptic number.

It is an amenable number.

231267963821 is a deficient number, since it is larger than the sum of its proper divisors (1).

231267963821 is an equidigital number, since it uses as much as digits as its factorization.

231267963821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The spelling of 231267963821 in words is "two hundred thirty-one billion, two hundred sixty-seven million, nine hundred sixty-three thousand, eight hundred twenty-one".