19942421863 has 16 divisors (see below), whose sum is σ = 25988316480. Its totient is φ = 14850464256.

The previous prime is 19942421857. The next prime is 19942421881. The reversal of 19942421863 is 36812424991.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19942421863 - 2¹³ = 19942413671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19942421563) 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 in 15 ways as a sum of consecutive naturals, for example, 6443968 + ... + 6447061.

It is an arithmetic number, because the mean of its divisors is an integer number (1624269780).

Almost surely, 2^19942421863 is an apocalyptic number.

19942421863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19942421863 is a deficient number, since it is larger than the sum of its proper divisors (6045894617).

19942421863 is a wasteful number, since it uses less digits than its factorization.

19942421863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12891066.

The product of its digits is 746496, while the sum is 49.

The spelling of 19942421863 in words is "nineteen billion, nine hundred forty-two million, four hundred twenty-one thousand, eight hundred sixty-three".