1111022212121 has 4 divisors (see below), whose sum is σ = 1111034218932. Its totient is φ = 1111010205312.

The previous prime is 1111022212099. The next prime is 1111022212163. The reversal of 1111022212121 is 1212122201111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1007443801225 + 103578410896 = 1003715^2 + 321836^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111022212121 - 2¹⁰ = 1111022211097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111022212121.

It is not an unprimeable number, because it can be changed into a prime (1111022212171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5863520 + ... + 6050033.

It is an arithmetic number, because the mean of its divisors is an integer number (277758554733).

Almost surely, 2^{1111022212121} is an apocalyptic number.

It is an amenable number.

1111022212121 is a deficient number, since it is larger than the sum of its proper divisors (12006811).

1111022212121 is an equidigital number, since it uses as much as digits as its factorization.

1111022212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12006810.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1111022212121 its reverse (1212122201111), we get a palindrome (2323144413232).

The spelling of 1111022212121 in words is "one trillion, one hundred eleven billion, twenty-two million, two hundred twelve thousand, one hundred twenty-one".