1011122111 has 4 divisors (see below), whose sum is σ = 1012115400. Its totient is φ = 1010128824.

The previous prime is 1011122017. The next prime is 1011122129. The reversal of 1011122111 is 1112211101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1112211101 = 2687 ⋅413923.

It is a cyclic number.

It is not a de Polignac number, because 1011122111 - 2¹⁴ = 1011105727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011122092 and 1011122101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011122131) 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, 495116 + ... + 497153.

It is an arithmetic number, because the mean of its divisors is an integer number (253028850).

Almost surely, 2^1011122111 is an apocalyptic number.

1011122111 is a deficient number, since it is larger than the sum of its proper divisors (993289).

1011122111 is an equidigital number, since it uses as much as digits as its factorization.

1011122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993288.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 1011122111 is about 31798.1463453454. The cubic root of 1011122111 is about 1003.6937100411.

Adding to 1011122111 its reverse (1112211101), we get a palindrome (2123333212).

The spelling of 1011122111 in words is "one billion, eleven million, one hundred twenty-two thousand, one hundred eleven".