1100002021 has 4 divisors (see below), whose sum is σ = 1100119372. Its totient is φ = 1099884672.

The previous prime is 1100001977. The next prime is 1100002031. The reversal of 1100002021 is 1202000011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 276024996 + 823977025 = 16614^2 + 28705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100002021 - 2¹⁷ = 1099870949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100001995 and 1100002013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100002031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43266 + ... + 63811.

It is an arithmetic number, because the mean of its divisors is an integer number (275029843).

Almost surely, 2^1100002021 is an apocalyptic number.

It is an amenable number.

1100002021 is a deficient number, since it is larger than the sum of its proper divisors (117351).

1100002021 is a wasteful number, since it uses less digits than its factorization.

1100002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117350.

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

The square root of 1100002021 is about 33166.2783712614. The cubic root of 1100002021 is about 1032.2807476493.

Adding to 1100002021 its reverse (1202000011), we get a palindrome (2302002032).

The spelling of 1100002021 in words is "one billion, one hundred million, two thousand, twenty-one".