1100200021 has 4 divisors (see below), whose sum is σ = 1125786112. Its totient is φ = 1074613932.

The previous prime is 1100200019. The next prime is 1100200039. The reversal of 1100200021 is 1200020011.

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: 1200020011 = 53 ⋅22641887.

It is a cyclic number.

It is not a de Polignac number, because 1100200021 - 2¹ = 1100200019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100199977 and 1100200013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100200061) 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, 12792981 + ... + 12793066.

It is an arithmetic number, because the mean of its divisors is an integer number (281446528).

Almost surely, 2^1100200021 is an apocalyptic number.

It is an amenable number.

1100200021 is a deficient number, since it is larger than the sum of its proper divisors (25586091).

1100200021 is an equidigital number, since it uses as much as digits as its factorization.

1100200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25586090.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1100200021 is about 33169.2631965198. The cubic root of 1100200021 is about 1032.3426806646.

Adding to 1100200021 its reverse (1200020011), we get a palindrome (2300220032).

The spelling of 1100200021 in words is "one billion, one hundred million, two hundred thousand, twenty-one".