1111211222121 has 384 divisors, whose sum is σ = 2308903833600. Its totient is φ = 496367585280.

The previous prime is 1111211222117. The next prime is 1111211222129. The reversal of 1111211222121 is 1212221121111.

It is a happy number.

1111211222121 is a `hidden beast` number, since 1 + 111 + 211 + 222 + 121 = 666.

It is not a de Polignac number, because 1111211222121 - 2² = 1111211222117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111211222094 and 1111211222103.

It is not an unprimeable number, because it can be changed into a prime (1111211222129) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 1343664910 + ... + 1343665736.

It is an arithmetic number, because the mean of its divisors is an integer number (6012770400).

Almost surely, 2^{1111211222121} is an apocalyptic number.

1111211222121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111211222121 is an abundant number, since it is smaller than the sum of its proper divisors (1197692611479).

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

1111211222121 is a wasteful number, since it uses less digits than its factorization.

1111211222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069 (or 1066 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 1111211222121 its reverse (1212221121111), we get a palindrome (2323432343232).

The spelling of 1111211222121 in words is "one trillion, one hundred eleven billion, two hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".