1021212121222 has 4 divisors (see below), whose sum is σ = 1531818181836. Its totient is φ = 510606060610.

The previous prime is 1021212121157. The next prime is 1021212121229. The reversal of 1021212121222 is 2221212121201.

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 1021212121222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021212121229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255303030304 + ... + 255303030307.

It is an arithmetic number, because the mean of its divisors is an integer number (382954545459).

Almost surely, 2^{1021212121222} is an apocalyptic number.

1021212121222 is a deficient number, since it is larger than the sum of its proper divisors (510606060614).

1021212121222 is an equidigital number, since it uses as much as digits as its factorization.

1021212121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510606060613.

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

Adding to 1021212121222 its reverse (2221212121201), we get a palindrome (3242424242423).

The spelling of 1021212121222 in words is "one trillion, twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-two".