2102203021 has 4 divisors (see below), whose sum is σ = 2102294844. Its totient is φ = 2102111200.

The previous prime is 2102202943. The next prime is 2102203027. The reversal of 2102203021 is 1203022012.

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 can be written as a sum of positive squares in 2 ways, for example, as 528494121 + 1573708900 = 22989^2 + 39670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102203021 - 2²⁷ = 1967985293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102202992 and 2102203010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102203027) 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, 19401 + ... + 67681.

It is an arithmetic number, because the mean of its divisors is an integer number (525573711).

Almost surely, 2^2102203021 is an apocalyptic number.

It is an amenable number.

2102203021 is a deficient number, since it is larger than the sum of its proper divisors (91823).

2102203021 is an equidigital number, since it uses as much as digits as its factorization.

2102203021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91822.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2102203021 is about 45849.7875785701. The cubic root of 2102203021 is about 1281.0268089325.

Adding to 2102203021 its reverse (1203022012), we get a palindrome (3305225033).

The spelling of 2102203021 in words is "two billion, one hundred two million, two hundred three thousand, twenty-one".