1211212222 has 32 divisors (see below), whose sum is σ = 2051702784. Its totient is φ = 531285600.

The previous prime is 1211212213. The next prime is 1211212229. The reversal of 1211212222 is 2222121121.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1211212196 and 1211212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211212229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258888 + ... + 263524.

It is an arithmetic number, because the mean of its divisors is an integer number (64115712).

Almost surely, 2^1211212222 is an apocalyptic number.

1211212222 is a deficient number, since it is larger than the sum of its proper divisors (840490562).

1211212222 is a wasteful number, since it uses less digits than its factorization.

1211212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5064.

The product of its digits is 64, while the sum is 16.

The square root of 1211212222 is about 34802.4743660562. The cubic root of 1211212222 is about 1065.9579710205.

Adding to 1211212222 its reverse (2222121121), we get a palindrome (3433333343).

The spelling of 1211212222 in words is "one billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty-two".