212401243 has 4 divisors (see below), whose sum is σ = 219252928. Its totient is φ = 205549560.

The previous prime is 212401237. The next prime is 212401289. The reversal of 212401243 is 342104212.

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

It is a cyclic number.

It is not a de Polignac number, because 212401243 - 2⁹ = 212400731 is a prime.

It is a super-2 number, since 2×212401243² = 90228576055890098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212401243.

It is not an unprimeable number, because it can be changed into a prime (212401543) 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, 3425796 + ... + 3425857.

It is an arithmetic number, because the mean of its divisors is an integer number (54813232).

Almost surely, 2^212401243 is an apocalyptic number.

212401243 is a deficient number, since it is larger than the sum of its proper divisors (6851685).

212401243 is an equidigital number, since it uses as much as digits as its factorization.

212401243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851684.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 212401243 is about 14573.9920063104. The cubic root of 212401243 is about 596.6491386436.

Adding to 212401243 its reverse (342104212), we get a palindrome (554505455).

The spelling of 212401243 in words is "two hundred twelve million, four hundred one thousand, two hundred forty-three".