1123220101 has 4 divisors (see below), whose sum is σ = 1123341804. Its totient is φ = 1123098400.

The previous prime is 1123220099. The next prime is 1123220177. The reversal of 1123220101 is 1010223211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1010223211 = 997 ⋅1013263.

It can be written as a sum of positive squares in 2 ways, for example, as 501715201 + 621504900 = 22399^2 + 24930^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123220101 - 2¹ = 1123220099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123220201) 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, 45760 + ... + 65881.

It is an arithmetic number, because the mean of its divisors is an integer number (280835451).

Almost surely, 2^1123220101 is an apocalyptic number.

It is an amenable number.

1123220101 is a deficient number, since it is larger than the sum of its proper divisors (121703).

1123220101 is a wasteful number, since it uses less digits than its factorization.

1123220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121702.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1123220101 is about 33514.4759917263. The cubic root of 1123220101 is about 1039.4931273238.

Adding to 1123220101 its reverse (1010223211), we get a palindrome (2133443312).

The spelling of 1123220101 in words is "one billion, one hundred twenty-three million, two hundred twenty thousand, one hundred one".