1222121221011 has 12 divisors (see below), whose sum is σ = 1765560022200. Its totient is φ = 814621104960.

The previous prime is 1222121220989. The next prime is 1222121221021. The reversal of 1222121221011 is 1101221212221.

1222121221011 is a `hidden beast` number, since 12 + 221 + 212 + 210 + 11 = 666.

It is not a de Polignac number, because 1222121221011 - 2⁷ = 1222121220883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222121221021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10470045 + ... + 10586126.

It is an arithmetic number, because the mean of its divisors is an integer number (147130001850).

Almost surely, 2^{1222121221011} is an apocalyptic number.

1222121221011 is a deficient number, since it is larger than the sum of its proper divisors (543438801189).

1222121221011 is a wasteful number, since it uses less digits than its factorization.

1222121221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21062626 (or 21062623 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1222121221011 its reverse (1101221212221), we get a palindrome (2323342433232).

It can be divided in two parts, 12221212210 and 11, that added together give a palindrome (12221212221).

The spelling of 1222121221011 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, eleven".