213242069 has 4 divisors (see below), whose sum is σ = 213559596. Its totient is φ = 212924544.

The previous prime is 213242027. The next prime is 213242077. The reversal of 213242069 is 960242312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25908100 + 187333969 = 5090^2 + 13687^2 .

It is a cyclic number.

It is not a de Polignac number, because 213242069 - 2¹⁶ = 213176533 is a prime.

It is a super-2 number, since 2×213242069² = 90944359982801522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213242009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157754 + ... + 159099.

It is an arithmetic number, because the mean of its divisors is an integer number (53389899).

Almost surely, 2^213242069 is an apocalyptic number.

It is an amenable number.

213242069 is a deficient number, since it is larger than the sum of its proper divisors (317527).

213242069 is an equidigital number, since it uses as much as digits as its factorization.

213242069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317526.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 213242069 is about 14602.8103117174. The cubic root of 213242069 is about 597.4354139674.

The spelling of 213242069 in words is "two hundred thirteen million, two hundred forty-two thousand, sixty-nine".