221340019 has 2 divisors, whose sum is σ = 221340020. Its totient is φ = 221340018.

The previous prime is 221339999. The next prime is 221340029. The reversal of 221340019 is 910043122.

221340019 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 a de Polignac number, because none of the positive numbers 2^k-221340019 is a prime.

It is a super-2 number, since 2×221340019² = 97982808021840722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221340029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110670009 + 110670010.

It is an arithmetic number, because the mean of its divisors is an integer number (110670010).

Almost surely, 2^221340019 is an apocalyptic number.

221340019 is a deficient number, since it is larger than the sum of its proper divisors (1).

221340019 is an equidigital number, since it uses as much as digits as its factorization.

221340019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 221340019 is about 14877.5004284994. The cubic root of 221340019 is about 604.9042664359.

The spelling of 221340019 in words is "two hundred twenty-one million, three hundred forty thousand, nineteen".