2100021023 has 4 divisors (see below), whose sum is σ = 2100120120. Its totient is φ = 2099921928.

The previous prime is 2100021013. The next prime is 2100021029. The reversal of 2100021023 is 3201200012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2100021023 - 2¹⁸ = 2099758879 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100020995 and 2100021013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100021029) 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, 3488 + ... + 64901.

It is an arithmetic number, because the mean of its divisors is an integer number (525030030).

Almost surely, 2^2100021023 is an apocalyptic number.

2100021023 is a deficient number, since it is larger than the sum of its proper divisors (99097).

2100021023 is an equidigital number, since it uses as much as digits as its factorization.

2100021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99096.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2100021023 is about 45825.9863287196. The cubic root of 2100021023 is about 1280.5834382456.

Adding to 2100021023 its reverse (3201200012), we get a palindrome (5301221035).

The spelling of 2100021023 in words is "two billion, one hundred million, twenty-one thousand, twenty-three".