421503442961 has 2 divisors, whose sum is σ = 421503442962. Its totient is φ = 421503442960.

The previous prime is 421503442957. The next prime is 421503443033. The reversal of 421503442961 is 169244305124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411169500625 + 10333942336 = 641225^2 + 101656^2 .

It is a cyclic number.

It is not a de Polignac number, because 421503442961 - 2² = 421503442957 is a prime.

It is not a weakly prime, because it can be changed into another prime (421503442951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210751721480 + 210751721481.

It is an arithmetic number, because the mean of its divisors is an integer number (210751721481).

Almost surely, 2^421503442961 is an apocalyptic number.

It is an amenable number.

421503442961 is a deficient number, since it is larger than the sum of its proper divisors (1).

421503442961 is an equidigital number, since it uses as much as digits as its factorization.

421503442961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 421503442961 in words is "four hundred twenty-one billion, five hundred three million, four hundred forty-two thousand, nine hundred sixty-one".