2105421250 has 20 divisors (see below), whose sum is σ = 3946403934. Its totient is φ = 842168000.

The previous prime is 2105421247. The next prime is 2105421277. The reversal of 2105421250 is 521245012.

It can be written as a sum of positive squares in 5 ways, for example, as 2556801 + 2102864449 = 1599^2 + 45857^2 .

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 840919 + ... + 843418.

Almost surely, 2^2105421250 is an apocalyptic number.

2105421250 is a deficient number, since it is larger than the sum of its proper divisors (1840982684).

2105421250 is an equidigital number, since it uses as much as digits as its factorization.

2105421250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684359 (or 1684344 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2105421250 is about 45884.8695105478. The cubic root of 2105421250 is about 1281.6801767903.

Adding to 2105421250 its reverse (521245012), we get a palindrome (2626666262).

The spelling of 2105421250 in words is "two billion, one hundred five million, four hundred twenty-one thousand, two hundred fifty".