1011122220121 has 4 divisors (see below), whose sum is σ = 1088900852452. Its totient is φ = 933343587792.

The previous prime is 1011122220011. The next prime is 1011122220149. The reversal of 1011122220121 is 1210222211101.

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 670695481600 + 340426738521 = 818960^2 + 583461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011122220121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011122220095 and 1011122220104.

It is not an unprimeable number, because it can be changed into a prime (1011122227121) 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, 38889316146 + ... + 38889316171.

It is an arithmetic number, because the mean of its divisors is an integer number (272225213113).

Almost surely, 2^{1011122220121} is an apocalyptic number.

It is an amenable number.

1011122220121 is a deficient number, since it is larger than the sum of its proper divisors (77778632331).

1011122220121 is an equidigital number, since it uses as much as digits as its factorization.

1011122220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77778632330.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1011122220121 its reverse (1210222211101), we get a palindrome (2221344431222).

The spelling of 1011122220121 in words is "one trillion, eleven billion, one hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".