2100521023 has 4 divisors (see below), whose sum is σ = 2191848048. Its totient is φ = 2009194000.

The previous prime is 2100520997. The next prime is 2100521047. The reversal of 2100521023 is 3201250012.

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

It is a cyclic number.

It is not a de Polignac number, because 2100521023 - 2⁵ = 2100520991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100520988 and 2100521006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100521063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45663478 + ... + 45663523.

It is an arithmetic number, because the mean of its divisors is an integer number (547962012).

Almost surely, 2^2100521023 is an apocalyptic number.

2100521023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2100521023 is a deficient number, since it is larger than the sum of its proper divisors (91327025).

2100521023 is an equidigital number, since it uses as much as digits as its factorization.

2100521023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91327024.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2100521023 is about 45831.4414239832. The cubic root of 2100521023 is about 1280.6850627694.

Adding to 2100521023 its reverse (3201250012), we get a palindrome (5301771035).

The spelling of 2100521023 in words is "two billion, one hundred million, five hundred twenty-one thousand, twenty-three".