1221111110122 has 8 divisors (see below), whose sum is σ = 1843959730500. Its totient is φ = 606457866624.

The previous prime is 1221111110071. The next prime is 1221111110123. The reversal of 1221111110122 is 2210111111221.

It can be written as a sum of positive squares in 2 ways, for example, as 1189366917561 + 31744192561 = 1090581^2 + 178169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1221111110122² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221111110096 and 1221111110105.

It is not an unprimeable number, because it can be changed into a prime (1221111110123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2048843847 + ... + 2048844442.

Almost surely, 2^{1221111110122} is an apocalyptic number.

1221111110122 is a deficient number, since it is larger than the sum of its proper divisors (622848620378).

1221111110122 is a wasteful number, since it uses less digits than its factorization.

1221111110122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4097688440.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1221111110122 its reverse (2210111111221), we get a palindrome (3431222221343).

The spelling of 1221111110122 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, one hundred twenty-two".