212223771 has 12 divisors (see below), whose sum is σ = 308319648. Its totient is φ = 140663664.

The previous prime is 212223761. The next prime is 212223797. The reversal of 212223771 is 177322212.

212223771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212223771 - 2⁶ = 212223707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212223721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66595 + ... + 69708.

It is an arithmetic number, because the mean of its divisors is an integer number (25693304).

Almost surely, 2^212223771 is an apocalyptic number.

212223771 is a deficient number, since it is larger than the sum of its proper divisors (96095877).

212223771 is a wasteful number, since it uses less digits than its factorization.

212223771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136482 (or 136479 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 212223771 is about 14567.9020795721. The cubic root of 212223771 is about 596.4829154774.

Adding to 212223771 its reverse (177322212), we get a palindrome (389545983).

The spelling of 212223771 in words is "two hundred twelve million, two hundred twenty-three thousand, seven hundred seventy-one".