221419969 has 2 divisors, whose sum is σ = 221419970. Its totient is φ = 221419968.

The previous prime is 221419931. The next prime is 221419987. The reversal of 221419969 is 969914122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219632400 + 1787569 = 14820^2 + 1337^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221419969 is a prime.

It is a super-2 number, since 2×221419969² = 98053605343921922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221419069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110709984 + 110709985.

It is an arithmetic number, because the mean of its divisors is an integer number (110709985).

Almost surely, 2^221419969 is an apocalyptic number.

It is an amenable number.

221419969 is a deficient number, since it is larger than the sum of its proper divisors (1).

221419969 is an equidigital number, since it uses as much as digits as its factorization.

221419969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 221419969 is about 14880.1871291997. The cubic root of 221419969 is about 604.9770899505.

The spelling of 221419969 in words is "two hundred twenty-one million, four hundred nineteen thousand, nine hundred sixty-nine".