1221121021122 has 40 divisors (see below), whose sum is σ = 2830567895100. Its totient is φ = 393004465056.

The previous prime is 1221121021073. The next prime is 1221121021123. The reversal of 1221121021122 is 2211201211221.

1221121021122 is a `hidden beast` number, since 1 + 221 + 1 + 210 + 211 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1219895951121 + 1225070001 = 1104489^2 + 35001^2 .

It is a super-2 number, since 2×1221121021122² (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 = 1221121021095 and 1221121021104.

It is not an unprimeable number, because it can be changed into a prime (1221121021123) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 129957097 + ... + 129966492.

Almost surely, 2^{1221121021122} is an apocalyptic number.

1221121021122 is an abundant number, since it is smaller than the sum of its proper divisors (1609446873978).

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

1221121021122 is a wasteful number, since it uses less digits than its factorization.

1221121021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259923632 (or 259923623 counting only the distinct ones).

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

Adding to 1221121021122 its reverse (2211201211221), we get a palindrome (3432322232343).

The spelling of 1221121021122 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, one hundred twenty-two".