1211205222 has 96 divisors (see below), whose sum is σ = 2845559808. Its totient is φ = 370960128.

The previous prime is 1211205221. The next prime is 1211205253. The reversal of 1211205222 is 2225021121.

1211205222 is a `hidden beast` number, since 1 + 21 + 120 + 522 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1211205195 and 1211205204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211205221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2615763 + ... + 2616225.

It is an arithmetic number, because the mean of its divisors is an integer number (29641248).

Almost surely, 2^1211205222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211205222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1422779904).

1211205222 is an abundant number, since it is smaller than the sum of its proper divisors (1634354586).

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

1211205222 is a wasteful number, since it uses less digits than its factorization.

1211205222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1211205222 is about 34802.3737983489. The cubic root of 1211205222 is about 1065.9559175075.

Adding to 1211205222 its reverse (2225021121), we get a palindrome (3436226343).

The spelling of 1211205222 in words is "one billion, two hundred eleven million, two hundred five thousand, two hundred twenty-two".