212242187 has 2 divisors, whose sum is σ = 212242188. Its totient is φ = 212242186.

The previous prime is 212242169. The next prime is 212242201. The reversal of 212242187 is 781242212.

212242187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212242187 - 2¹⁴ = 212225803 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212242487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106121093 + 106121094.

It is an arithmetic number, because the mean of its divisors is an integer number (106121094).

Almost surely, 2^212242187 is an apocalyptic number.

212242187 is a deficient number, since it is larger than the sum of its proper divisors (1).

212242187 is an equidigital number, since it uses as much as digits as its factorization.

212242187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584, while the sum is 29.

The square root of 212242187 is about 14568.5341404000. The cubic root of 212242187 is about 596.5001685111.

Adding to 212242187 its reverse (781242212), we get a palindrome (993484399).

The spelling of 212242187 in words is "two hundred twelve million, two hundred forty-two thousand, one hundred eighty-seven".