42821503961 has 2 divisors, whose sum is σ = 42821503962. Its totient is φ = 42821503960.

The previous prime is 42821503889. The next prime is 42821503979. The reversal of 42821503961 is 16930512824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42615409225 + 206094736 = 206435^2 + 14356^2 .

It is a cyclic number.

It is not a de Polignac number, because 42821503961 - 2¹⁰ = 42821502937 is a prime.

It is not a weakly prime, because it can be changed into another prime (42821500961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21410751980 + 21410751981.

It is an arithmetic number, because the mean of its divisors is an integer number (21410751981).

Almost surely, 2^42821503961 is an apocalyptic number.

It is an amenable number.

42821503961 is a deficient number, since it is larger than the sum of its proper divisors (1).

42821503961 is an equidigital number, since it uses as much as digits as its factorization.

42821503961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 42821503961 in words is "forty-two billion, eight hundred twenty-one million, five hundred three thousand, nine hundred sixty-one".