2100011021 has 16 divisors (see below), whose sum is σ = 2317206528. Its totient is φ = 1896470400.

The previous prime is 2100011009. The next prime is 2100011041. The reversal of 2100011021 is 1201100012.

It is a cyclic number.

It is not a de Polignac number, because 2100011021 - 2¹⁸ = 2099748877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100011041) 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, 6686 + ... + 65151.

It is an arithmetic number, because the mean of its divisors is an integer number (144825408).

Almost surely, 2^2100011021 is an apocalyptic number.

It is an amenable number.

2100011021 is a deficient number, since it is larger than the sum of its proper divisors (217195507).

2100011021 is a wasteful number, since it uses less digits than its factorization.

2100011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71932.

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

The square root of 2100011021 is about 45825.8771983690. The cubic root of 2100011021 is about 1280.5814051840.

Adding to 2100011021 its reverse (1201100012), we get a palindrome (3301111033).

The spelling of 2100011021 in words is "two billion, one hundred million, eleven thousand, twenty-one".