221530019 has 2 divisors, whose sum is σ = 221530020. Its totient is φ = 221530018.

The previous prime is 221529991. The next prime is 221530021. The reversal of 221530019 is 910035122.

221530019 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 221530019 - 2¹² = 221525923 is a prime.

It is a super-2 number, since 2×221530019² = 98151098636280722, which contains 22 as substring.

Together with 221530021, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221529976 and 221530003.

It is not a weakly prime, because it can be changed into another prime (221530079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110765009 + 110765010.

It is an arithmetic number, because the mean of its divisors is an integer number (110765010).

Almost surely, 2^221530019 is an apocalyptic number.

221530019 is a deficient number, since it is larger than the sum of its proper divisors (1).

221530019 is an equidigital number, since it uses as much as digits as its factorization.

221530019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 221530019 is about 14883.8845399983. The cubic root of 221530019 is about 605.0773017817.

The spelling of 221530019 in words is "two hundred twenty-one million, five hundred thirty thousand, nineteen".