2102440421 has 4 divisors (see below), whose sum is σ = 2213095200. Its totient is φ = 1991785644.

The previous prime is 2102440399. The next prime is 2102440441. The reversal of 2102440421 is 1240442012.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102440421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102440393 and 2102440402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102440441) 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, 55327361 + ... + 55327398.

It is an arithmetic number, because the mean of its divisors is an integer number (553273800).

Almost surely, 2^2102440421 is an apocalyptic number.

It is an amenable number.

2102440421 is a deficient number, since it is larger than the sum of its proper divisors (110654779).

2102440421 is a wasteful number, since it uses less digits than its factorization.

2102440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110654778.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 2102440421 is about 45852.3763942503. The cubic root of 2102440421 is about 1281.0750288735.

Adding to 2102440421 its reverse (1240442012), we get a palindrome (3342882433).

The spelling of 2102440421 in words is "two billion, one hundred two million, four hundred forty thousand, four hundred twenty-one".