21980219803 has 2 divisors, whose sum is σ = 21980219804. Its totient is φ = 21980219802.

The previous prime is 21980219791. The next prime is 21980219827. The reversal of 21980219803 is 30891208912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21980219803 - 2⁵ = 21980219771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21980219803.

It is not a weakly prime, because it can be changed into another prime (21980219873) 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, 10990109901 + 10990109902.

It is an arithmetic number, because the mean of its divisors is an integer number (10990109902).

Almost surely, 2^21980219803 is an apocalyptic number.

21980219803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21980219803 is an equidigital number, since it uses as much as digits as its factorization.

21980219803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 21980219803 in words is "twenty-one billion, nine hundred eighty million, two hundred nineteen thousand, eight hundred three".