1101200021 has 4 divisors (see below), whose sum is σ = 1102399200. Its totient is φ = 1100000844.

The previous prime is 1101199997. The next prime is 1101200033. The reversal of 1101200021 is 1200021011.

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.

It is a cyclic number.

It is not a de Polignac number, because 1101200021 - 2¹⁴ = 1101183637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1101199981 and 1101200008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101200521) 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, 598211 + ... + 600048.

It is an arithmetic number, because the mean of its divisors is an integer number (275599800).

Almost surely, 2^1101200021 is an apocalyptic number.

It is an amenable number.

1101200021 is a deficient number, since it is larger than the sum of its proper divisors (1199179).

1101200021 is an equidigital number, since it uses as much as digits as its factorization.

1101200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199178.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1101200021 is about 33184.3339695104. Note that the first 3 decimals coincide. The cubic root of 1101200021 is about 1032.6553601909.

Adding to 1101200021 its reverse (1200021011), we get a palindrome (2301221032).

The spelling of 1101200021 in words is "one billion, one hundred one million, two hundred thousand, twenty-one".