63421999493 has 2 divisors, whose sum is σ = 63421999494. Its totient is φ = 63421999492.

The previous prime is 63421999463. The next prime is 63421999507. The reversal of 63421999493 is 39499912436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39785089444 + 23636910049 = 199462^2 + 153743^2 .

It is a cyclic number.

It is not a de Polignac number, because 63421999493 - 2⁶ = 63421999429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63421999453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31710999746 + 31710999747.

It is an arithmetic number, because the mean of its divisors is an integer number (31710999747).

Almost surely, 2^63421999493 is an apocalyptic number.

It is an amenable number.

63421999493 is a deficient number, since it is larger than the sum of its proper divisors (1).

63421999493 is an equidigital number, since it uses as much as digits as its factorization.

63421999493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11337408, while the sum is 59.

The spelling of 63421999493 in words is "sixty-three billion, four hundred twenty-one million, nine hundred ninety-nine thousand, four hundred ninety-three".