12331631821 has 2 divisors, whose sum is σ = 12331631822. Its totient is φ = 12331631820.

The previous prime is 12331631779. The next prime is 12331631863. The reversal of 12331631821 is 12813613321.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (12331631779) and next prime (12331631863).

It can be written as a sum of positive squares in only one way, i.e., 9321902500 + 3009729321 = 96550^2 + 54861^2 .

It is a cyclic number.

It is not a de Polignac number, because 12331631821 - 2¹⁵ = 12331599053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12331631621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6165815910 + 6165815911.

It is an arithmetic number, because the mean of its divisors is an integer number (6165815911).

Almost surely, 2^12331631821 is an apocalyptic number.

It is an amenable number.

12331631821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12331631821 is an equidigital number, since it uses as much as digits as its factorization.

12331631821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The spelling of 12331631821 in words is "twelve billion, three hundred thirty-one million, six hundred thirty-one thousand, eight hundred twenty-one".