213240244 has 12 divisors (see below), whose sum is σ = 426480544. Its totient is φ = 91388664.

The previous prime is 213240149. The next prime is 213240281. The reversal of 213240244 is 442042312.

It is a happy number.

213240244 is an admirable number.

It is a super-2 number, since 2×213240244² = 90942803322359072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3807834 + ... + 3807889.

Almost surely, 2^213240244 is an apocalyptic number.

It is an amenable number.

213240244 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213240244 is a wasteful number, since it uses less digits than its factorization.

213240244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7615734 (or 7615732 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 213240244 is about 14602.7478236118. The cubic root of 213240244 is about 597.4337096090.

Adding to 213240244 its reverse (442042312), we get a palindrome (655282556).

The spelling of 213240244 in words is "two hundred thirteen million, two hundred forty thousand, two hundred forty-four".