1221212212022 has 16 divisors (see below), whose sum is σ = 2007818103744. Its totient is φ = 552465669000.

The previous prime is 1221212212019. The next prime is 1221212212027. The reversal of 1221212212022 is 2202122121221.

It is a junction number, because it is equal to n+sod(n) for n = 1221212211985 and 1221212212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221212212027) 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, 131534804 + ... + 131544087.

It is an arithmetic number, because the mean of its divisors is an integer number (125488631484).

Almost surely, 2^{1221212212022} is an apocalyptic number.

1221212212022 is a deficient number, since it is larger than the sum of its proper divisors (786605891722).

1221212212022 is a wasteful number, since it uses less digits than its factorization.

1221212212022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263079115.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1221212212022 its reverse (2202122121221), we get a palindrome (3423334333243).

The spelling of 1221212212022 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, twenty-two".