1212121021222 has 4 divisors (see below), whose sum is σ = 1818181531836. Its totient is φ = 606060510610.

The previous prime is 1212121021219. The next prime is 1212121021229. The reversal of 1212121021222 is 2221201212121.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1212121021222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212121021229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303030255304 + ... + 303030255307.

It is an arithmetic number, because the mean of its divisors is an integer number (454545382959).

Almost surely, 2^{1212121021222} is an apocalyptic number.

1212121021222 is a deficient number, since it is larger than the sum of its proper divisors (606060510614).

1212121021222 is an equidigital number, since it uses as much as digits as its factorization.

1212121021222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606060510613.

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

Adding to 1212121021222 its reverse (2221201212121), we get a palindrome (3433322233343).

The spelling of 1212121021222 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty-two".