2103122221 has 4 divisors (see below), whose sum is σ = 2104481500. Its totient is φ = 2101762944.

The previous prime is 2103122167. The next prime is 2103122239. The reversal of 2103122221 is 1222213012.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1381608900 + 721513321 = 37170^2 + 26861^2 .

It is a cyclic number.

It is not a de Polignac number, because 2103122221 - 2¹⁵ = 2103089453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2103122195 and 2103122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2103122251) 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, 677316 + ... + 680413.

It is an arithmetic number, because the mean of its divisors is an integer number (526120375).

Almost surely, 2^2103122221 is an apocalyptic number.

It is an amenable number.

2103122221 is a deficient number, since it is larger than the sum of its proper divisors (1359279).

2103122221 is a wasteful number, since it uses less digits than its factorization.

2103122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359278.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2103122221 is about 45859.8105207599. The cubic root of 2103122221 is about 1281.2134937653.

Adding to 2103122221 its reverse (1222213012), we get a palindrome (3325335233).

The spelling of 2103122221 in words is "two billion, one hundred three million, one hundred twenty-two thousand, two hundred twenty-one".