41990976821 has 2 divisors, whose sum is σ = 41990976822. Its totient is φ = 41990976820.

The previous prime is 41990976817. The next prime is 41990976823. The reversal of 41990976821 is 12867909914.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23218140625 + 18772836196 = 152375^2 + 137014^2 .

It is a cyclic number.

It is not a de Polignac number, because 41990976821 - 2² = 41990976817 is a prime.

Together with 41990976823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41990976823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20995488410 + 20995488411.

It is an arithmetic number, because the mean of its divisors is an integer number (20995488411).

Almost surely, 2^41990976821 is an apocalyptic number.

It is an amenable number.

41990976821 is a deficient number, since it is larger than the sum of its proper divisors (1).

41990976821 is an equidigital number, since it uses as much as digits as its factorization.

41990976821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The spelling of 41990976821 in words is "forty-one billion, nine hundred ninety million, nine hundred seventy-six thousand, eight hundred twenty-one".