1211222021212 has 24 divisors (see below), whose sum is σ = 2431064855520. Its totient is φ = 517247834880.

The previous prime is 1211222021209. The next prime is 1211222021221. The reversal of 1211222021212 is 2121202221121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211222021212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76963537 + ... + 76979272.

It is an arithmetic number, because the mean of its divisors is an integer number (101294368980).

Almost surely, 2^{1211222021212} is an apocalyptic number.

It is an amenable number.

1211222021212 is an abundant number, since it is smaller than the sum of its proper divisors (1219842834308).

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

1211222021212 is a wasteful number, since it uses less digits than its factorization.

1211222021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153943101 (or 153943099 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1211222021212 its reverse (2121202221121), we get a palindrome (3332424242333).

The spelling of 1211222021212 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, twenty-one thousand, two hundred twelve".