1123201021 has 16 divisors (see below), whose sum is σ = 1212023808. Its totient is φ = 1037836800.

The previous prime is 1123201007. The next prime is 1123201031. The reversal of 1123201021 is 1201023211.

It is a cyclic number.

It is not a de Polignac number, because 1123201021 - 2¹⁵ = 1123168253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123200992 and 1123201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123201031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 538701 + ... + 540781.

It is an arithmetic number, because the mean of its divisors is an integer number (75751488).

Almost surely, 2^1123201021 is an apocalyptic number.

It is an amenable number.

1123201021 is a deficient number, since it is larger than the sum of its proper divisors (88822787).

1123201021 is a wasteful number, since it uses less digits than its factorization.

1123201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892.

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

The square root of 1123201021 is about 33514.1913374021. The cubic root of 1123201021 is about 1039.4872413770.

Adding to 1123201021 its reverse (1201023211), we get a palindrome (2324224232).

The spelling of 1123201021 in words is "one billion, one hundred twenty-three million, two hundred one thousand, twenty-one".