1122100021 has 4 divisors (see below), whose sum is σ = 1282400032. Its totient is φ = 961800012.

The previous prime is 1122099959. The next prime is 1122100033. The reversal of 1122100021 is 1200012211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1200012211 = 233 ⋅5150267.

It is a cyclic number.

It is not a de Polignac number, because 1122100021 - 2⁷ = 1122099893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1122099980 and 1122100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122100061) 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, 80149995 + ... + 80150008.

It is an arithmetic number, because the mean of its divisors is an integer number (320600008).

Almost surely, 2^1122100021 is an apocalyptic number.

It is an amenable number.

1122100021 is a deficient number, since it is larger than the sum of its proper divisors (160300011).

1122100021 is an equidigital number, since it uses as much as digits as its factorization.

1122100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160300010.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1122100021 is about 33497.7614326689. The cubic root of 1122100021 is about 1039.1474833739.

Adding to 1122100021 its reverse (1200012211), we get a palindrome (2322112232).

The spelling of 1122100021 in words is "one billion, one hundred twenty-two million, one hundred thousand, twenty-one".