1221202112122 has 4 divisors (see below), whose sum is σ = 1831803168186. Its totient is φ = 610601056060.

The previous prime is 1221202112063. The next prime is 1221202112159. The reversal of 1221202112122 is 2212112021221.

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

It can be written as a sum of positive squares in only one way, i.e., 698312593801 + 522889518321 = 835651^2 + 723111^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1221202112122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305300528029 + ... + 305300528032.

Almost surely, 2^{1221202112122} is an apocalyptic number.

1221202112122 is a deficient number, since it is larger than the sum of its proper divisors (610601056064).

1221202112122 is an equidigital number, since it uses as much as digits as its factorization.

1221202112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610601056063.

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

Adding to 1221202112122 its reverse (2212112021221), we get a palindrome (3433314133343).

Subtracting 1221202112122 from its reverse (2212112021221), we obtain a palindrome (990909909099).

The spelling of 1221202112122 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred twelve thousand, one hundred twenty-two".