247213213 has 8 divisors (see below), whose sum is σ = 266462168. Its totient is φ = 227997504.

The previous prime is 247213207. The next prime is 247213283. The reversal of 247213213 is 312312742.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 484 + 247212729 = 22^2 + 15723^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 247213213 - 2⁹ = 247212701 is a prime.

It is a super-2 number, since 2×247213213² = 122228745363566738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247213283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8395 + ... + 23767.

It is an arithmetic number, because the mean of its divisors is an integer number (33307771).

Almost surely, 2^247213213 is an apocalyptic number.

It is an amenable number.

247213213 is a deficient number, since it is larger than the sum of its proper divisors (19248955).

247213213 is a wasteful number, since it uses less digits than its factorization.

247213213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16623.

The product of its digits is 2016, while the sum is 25.

The square root of 247213213 is about 15723.0153914572. The cubic root of 247213213 is about 627.6110187005.

Adding to 247213213 its reverse (312312742), we get a palindrome (559525955).

The spelling of 247213213 in words is "two hundred forty-seven million, two hundred thirteen thousand, two hundred thirteen".