63231111821 has 2 divisors, whose sum is σ = 63231111822. Its totient is φ = 63231111820.

The previous prime is 63231111817. The next prime is 63231111829. The reversal of 63231111821 is 12811113236.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60809094025 + 2422017796 = 246595^2 + 49214^2 .

It is a cyclic number.

It is not a de Polignac number, because 63231111821 - 2² = 63231111817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63231111829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31615555910 + 31615555911.

It is an arithmetic number, because the mean of its divisors is an integer number (31615555911).

Almost surely, 2^63231111821 is an apocalyptic number.

It is an amenable number.

63231111821 is a deficient number, since it is larger than the sum of its proper divisors (1).

63231111821 is an equidigital number, since it uses as much as digits as its factorization.

63231111821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The spelling of 63231111821 in words is "sixty-three billion, two hundred thirty-one million, one hundred eleven thousand, eight hundred twenty-one".