2103361621 has 4 divisors (see below), whose sum is σ = 2103532000. Its totient is φ = 2103191244.

The previous prime is 2103361609. The next prime is 2103361633. The reversal of 2103361621 is 1261633012.

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 an interprime number because it is at equal distance from previous prime (2103361609) and next prime (2103361633).

It is a cyclic number.

It is not a de Polignac number, because 2103361621 - 2¹³ = 2103353429 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 (2103361651) 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 3 ways as a sum of consecutive naturals, for example, 65091 + ... + 91888.

It is an arithmetic number, because the mean of its divisors is an integer number (525883000).

Almost surely, 2^2103361621 is an apocalyptic number.

It is an amenable number.

2103361621 is a deficient number, since it is larger than the sum of its proper divisors (170379).

2103361621 is a wasteful number, since it uses less digits than its factorization.

2103361621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170378.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 2103361621 is about 45862.4205750198. The cubic root of 2103361621 is about 1281.2621057559.

Adding to 2103361621 its reverse (1261633012), we get a palindrome (3364994633).

The spelling of 2103361621 in words is "two billion, one hundred three million, three hundred sixty-one thousand, six hundred twenty-one".