2100443021 has 4 divisors (see below), whose sum is σ = 2109862272. Its totient is φ = 2091023772.

The previous prime is 2100442999. The next prime is 2100443029. The reversal of 2100443021 is 1203440012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2100443021 - 2⁶ = 2100442957 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 (2100443029) 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, 4709291 + ... + 4709736.

It is an arithmetic number, because the mean of its divisors is an integer number (527465568).

Almost surely, 2^2100443021 is an apocalyptic number.

It is an amenable number.

2100443021 is a deficient number, since it is larger than the sum of its proper divisors (9419251).

2100443021 is an equidigital number, since it uses as much as digits as its factorization.

2100443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9419250.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2100443021 is about 45830.5904500477. The cubic root of 2100443021 is about 1280.6692099990.

Adding to 2100443021 its reverse (1203440012), we get a palindrome (3303883033).

The spelling of 2100443021 in words is "two billion, one hundred million, four hundred forty-three thousand, twenty-one".