1211220222 has 16 divisors (see below), whose sum is σ = 2434739472. Its totient is φ = 401690240.

The previous prime is 1211220217. The next prime is 1211220223. The reversal of 1211220222 is 2220221121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211220223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511179 + ... + 513542.

It is an arithmetic number, because the mean of its divisors is an integer number (152171217).

Almost surely, 2^1211220222 is an apocalyptic number.

1211220222 is an abundant number, since it is smaller than the sum of its proper divisors (1223519250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211220222 is a wasteful number, since it uses less digits than its factorization.

1211220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024923.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1211220222 is about 34802.5893002231. The cubic root of 1211220222 is about 1065.9603178829.

Adding to 1211220222 its reverse (2220221121), we get a palindrome (3431441343).

The spelling of 1211220222 in words is "one billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty-two".