1121122212221 has 24 divisors (see below), whose sum is σ = 1240259791680. Its totient is φ = 1004926454400.

The previous prime is 1121122212169. The next prime is 1121122212229. The reversal of 1121122212221 is 1222122211211.

It is not a de Polignac number, because 1121122212221 - 2¹⁸ = 1121121950077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121122212193 and 1121122212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121122212229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136203176 + ... + 136211406.

It is an arithmetic number, because the mean of its divisors is an integer number (51677491320).

Almost surely, 2^{1121122212221} is an apocalyptic number.

1121122212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121122212221 is a deficient number, since it is larger than the sum of its proper divisors (119137579459).

1121122212221 is an frugal number, since it uses more digits than its factorization.

1121122212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9077 (or 8704 counting only the distinct ones).

The product of its digits is 128, while the sum is 20.

Adding to 1121122212221 its reverse (1222122211211), we get a palindrome (2343244423432).

The spelling of 1121122212221 in words is "one trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".