1963712021 has 2 divisors, whose sum is σ = 1963712022. Its totient is φ = 1963712020.

The previous prime is 1963712017. The next prime is 1963712027. The reversal of 1963712021 is 1202173691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1103169796 + 860542225 = 33214^2 + 29335^2 .

It is an emirp because it is prime and its reverse (1202173691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1963712021 - 2² = 1963712017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1963712027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 981856010 + 981856011.

It is an arithmetic number, because the mean of its divisors is an integer number (981856011).

Almost surely, 2^1963712021 is an apocalyptic number.

It is an amenable number.

1963712021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1963712021 is an equidigital number, since it uses as much as digits as its factorization.

1963712021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1963712021 is about 44313.7904156257. The cubic root of 1963712021 is about 1252.2544958342.

The spelling of 1963712021 in words is "one billion, nine hundred sixty-three million, seven hundred twelve thousand, twenty-one".