221802019 has 2 divisors, whose sum is σ = 221802020. Its totient is φ = 221802018.

The previous prime is 221802001. The next prime is 221802023. The reversal of 221802019 is 910208122.

221802019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221802019 - 2⁷ = 221801891 is a prime.

It is a super-2 number, since 2×221802019² = 98392271264952722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221801984 and 221802002.

It is not a weakly prime, because it can be changed into another prime (221802079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110901009 + 110901010.

It is an arithmetic number, because the mean of its divisors is an integer number (110901010).

Almost surely, 2^221802019 is an apocalyptic number.

221802019 is a deficient number, since it is larger than the sum of its proper divisors (1).

221802019 is an equidigital number, since it uses as much as digits as its factorization.

221802019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 221802019 is about 14893.0191364948. The cubic root of 221802019 is about 605.3248434224.

The spelling of 221802019 in words is "two hundred twenty-one million, eight hundred two thousand, nineteen".