221111199989 has 2 divisors, whose sum is σ = 221111199990. Its totient is φ = 221111199988.

The previous prime is 221111199877. The next prime is 221111200007. The reversal of 221111199989 is 989991111122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192582300964 + 28528899025 = 438842^2 + 168905^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111199989 - 2⁸ = 221111199733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221111199989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221111199289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555599994 + 110555599995.

It is an arithmetic number, because the mean of its divisors is an integer number (110555599995).

Almost surely, 2^221111199989 is an apocalyptic number.

It is an amenable number.

221111199989 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111199989 is an equidigital number, since it uses as much as digits as its factorization.

221111199989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 53.

The spelling of 221111199989 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred ninety-nine thousand, nine hundred eighty-nine".