2103121221 has 16 divisors (see below), whose sum is σ = 2974848768. Its totient is φ = 1317056000.

The previous prime is 2103121213. The next prime is 2103121231. The reversal of 2103121221 is 1221213012.

It is a cyclic number.

It is not a de Polignac number, because 2103121221 - 2³ = 2103121213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2103121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2103121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13005 + ... + 66146.

It is an arithmetic number, because the mean of its divisors is an integer number (185928048).

Almost surely, 2^2103121221 is an apocalyptic number.

It is an amenable number.

2103121221 is a deficient number, since it is larger than the sum of its proper divisors (871727547).

2103121221 is a wasteful number, since it uses less digits than its factorization.

2103121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79692.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2103121221 is about 45859.7996179661. The cubic root of 2103121221 is about 1281.2132907000.

Adding to 2103121221 its reverse (1221213012), we get a palindrome (3324334233).

The spelling of 2103121221 in words is "two billion, one hundred three million, one hundred twenty-one thousand, two hundred twenty-one".