11963424821 has 2 divisors, whose sum is σ = 11963424822. Its totient is φ = 11963424820.

The previous prime is 11963424779. The next prime is 11963424833. The reversal of 11963424821 is 12842436911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11488838596 + 474586225 = 107186^2 + 21785^2 .

It is a cyclic number.

It is not a de Polignac number, because 11963424821 - 2¹⁴ = 11963408437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11963424871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5981712410 + 5981712411.

It is an arithmetic number, because the mean of its divisors is an integer number (5981712411).

Almost surely, 2^11963424821 is an apocalyptic number.

It is an amenable number.

11963424821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11963424821 is an equidigital number, since it uses as much as digits as its factorization.

11963424821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The spelling of 11963424821 in words is "eleven billion, nine hundred sixty-three million, four hundred twenty-four thousand, eight hundred twenty-one".