221440019 has 2 divisors, whose sum is σ = 221440020. Its totient is φ = 221440018.

The previous prime is 221440013. The next prime is 221440061. The reversal of 221440019 is 910044122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221440019 - 2⁸ = 221439763 is a prime.

It is a super-2 number, since 2×221440019² = 98071364029440722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221439976 and 221440003.

It is not a weakly prime, because it can be changed into another prime (221440013) 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, 110720009 + 110720010.

It is an arithmetic number, because the mean of its divisors is an integer number (110720010).

Almost surely, 2^221440019 is an apocalyptic number.

221440019 is a deficient number, since it is larger than the sum of its proper divisors (1).

221440019 is an equidigital number, since it uses as much as digits as its factorization.

221440019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 221440019 is about 14880.8608285946. The cubic root of 221440019 is about 604.9953500087.

The spelling of 221440019 in words is "two hundred twenty-one million, four hundred forty thousand, nineteen".