213723019 has 2 divisors, whose sum is σ = 213723020. Its totient is φ = 213723018.

The previous prime is 213722947. The next prime is 213723071. The reversal of 213723019 is 910327312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213723019 - 2⁷ = 213722891 is a prime.

It is a super-2 number, since 2×213723019² = 91355057700948722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213723319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106861509 + 106861510.

It is an arithmetic number, because the mean of its divisors is an integer number (106861510).

Almost surely, 2^213723019 is an apocalyptic number.

213723019 is a deficient number, since it is larger than the sum of its proper divisors (1).

213723019 is an equidigital number, since it uses as much as digits as its factorization.

213723019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 213723019 is about 14619.2687573627. The cubic root of 213723019 is about 597.8842322402.

The spelling of 213723019 in words is "two hundred thirteen million, seven hundred twenty-three thousand, nineteen".