1221111022122 has 24 divisors (see below), whose sum is σ = 2651850820164. Its totient is φ = 406096965504.

The previous prime is 1221111022099. The next prime is 1221111022189. The reversal of 1221111022122 is 2212201111221.

It can be written as a sum of positive squares in 2 ways, for example, as 824411336841 + 396699685281 = 907971^2 + 629841^2 .

It is a super-2 number, since 2×1221111022122² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221111022095 and 1221111022104.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 78328813 + ... + 78344400.

Almost surely, 2^{1221111022122} is an apocalyptic number.

1221111022122 is an abundant number, since it is smaller than the sum of its proper divisors (1430739798042).

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

1221111022122 is a wasteful number, since it uses less digits than its factorization.

1221111022122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156673654 (or 156673651 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221111022122 its reverse (2212201111221), we get a palindrome (3433312133343).

The spelling of 1221111022122 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, twenty-two thousand, one hundred twenty-two".