1211221022 has 16 divisors (see below), whose sum is σ = 1997132544. Its totient is φ = 546351000.

The previous prime is 1211221019. The next prime is 1211221043. The reversal of 1211221022 is 2201221121.

It is a junction number, because it is equal to n+sod(n) for n = 1211220988 and 1211221006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207254 + ... + 213017.

It is an arithmetic number, because the mean of its divisors is an integer number (124820784).

Almost surely, 2^1211221022 is an apocalyptic number.

1211221022 is a deficient number, since it is larger than the sum of its proper divisors (785911522).

1211221022 is a wasteful number, since it uses less digits than its factorization.

1211221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420415.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1211221022 is about 34802.6007936189. The cubic root of 1211221022 is about 1065.9605525685.

Adding to 1211221022 its reverse (2201221121), we get a palindrome (3412442143).

Subtracting 1211221022 from its reverse (2201221121), we obtain a palindrome (990000099).

The spelling of 1211221022 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, twenty-two".