212222231 has 4 divisors (see below), whose sum is σ = 228547032. Its totient is φ = 195897432.

The previous prime is 212222189. The next prime is 212222291. The reversal of 212222231 is 132222212.

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 212222231 - 2⁶ = 212222167 is a prime.

It is a super-2 number, since 2×212222231² = 90076550661234722, 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 (212222291) 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, 8162381 + ... + 8162406.

It is an arithmetic number, because the mean of its divisors is an integer number (57136758).

Almost surely, 2^212222231 is an apocalyptic number.

212222231 is a deficient number, since it is larger than the sum of its proper divisors (16324801).

212222231 is a wasteful number, since it uses less digits than its factorization.

212222231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16324800.

The product of its digits is 192, while the sum is 17.

The square root of 212222231 is about 14567.8492235470. The cubic root of 212222231 is about 596.4814726828.

Adding to 212222231 its reverse (132222212), we get a palindrome (344444443).

The spelling of 212222231 in words is "two hundred twelve million, two hundred twenty-two thousand, two hundred thirty-one".