1211022205 has 16 divisors (see below), whose sum is σ = 1486840320. Its totient is φ = 946662912.

The previous prime is 1211022193. The next prime is 1211022229. The reversal of 1211022205 is 5022201121.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211022205 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22512 + ... + 54118.

It is an arithmetic number, because the mean of its divisors is an integer number (92927520).

Almost surely, 2^1211022205 is an apocalyptic number.

It is an amenable number.

1211022205 is a deficient number, since it is larger than the sum of its proper divisors (275818115).

1211022205 is an equidigital number, since it uses as much as digits as its factorization.

1211022205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31788.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1211022205 is about 34799.7443237734. The cubic root of 1211022205 is about 1065.9022250152.

Adding to 1211022205 its reverse (5022201121), we get a palindrome (6233223326).

The spelling of 1211022205 in words is "one billion, two hundred eleven million, twenty-two thousand, two hundred five".