2110100021 has 4 divisors (see below), whose sum is σ = 2133809100. Its totient is φ = 2086390944.

The previous prime is 2110100009. The next prime is 2110100029. The reversal of 2110100021 is 1200010112.

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 351975121 + 1758124900 = 18761^2 + 41930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2110100021 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 = 2110099981 and 2110100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2110100029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11854406 + ... + 11854583.

It is an arithmetic number, because the mean of its divisors is an integer number (533452275).

Almost surely, 2^2110100021 is an apocalyptic number.

It is an amenable number.

2110100021 is a deficient number, since it is larger than the sum of its proper divisors (23709079).

2110100021 is an equidigital number, since it uses as much as digits as its factorization.

2110100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23709078.

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

The square root of 2110100021 is about 45935.8250279670. The cubic root of 2110100021 is about 1282.6288786986.

Adding to 2110100021 its reverse (1200010112), we get a palindrome (3310110133).

The spelling of 2110100021 in words is "two billion, one hundred ten million, one hundred thousand, twenty-one".