2103101021 has 6 divisors (see below), whose sum is σ = 2446464510. Its totient is φ = 1802657976.

The previous prime is 2103101017. The next prime is 2103101023. The reversal of 2103101021 is 1201013012.

It can be written as a sum of positive squares in only one way, i.e., 1886599225 + 216501796 = 43435^2 + 14714^2 .

It is not a de Polignac number, because 2103101021 - 2² = 2103101017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2103100993 and 2103101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2103101023) 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 5 ways as a sum of consecutive naturals, for example, 21460166 + ... + 21460263.

It is an arithmetic number, because the mean of its divisors is an integer number (407744085).

Almost surely, 2^2103101021 is an apocalyptic number.

It is an amenable number.

2103101021 is a deficient number, since it is larger than the sum of its proper divisors (343363489).

2103101021 is an equidigital number, since it uses as much as digits as its factorization.

2103101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42920443 (or 42920436 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 2103101021 is about 45859.5793809756. The cubic root of 2103101021 is about 1281.2091887663.

Adding to 2103101021 its reverse (1201013012), we get a palindrome (3304114033).

The spelling of 2103101021 in words is "two billion, one hundred three million, one hundred one thousand, twenty-one".