2105421015 has 32 divisors (see below), whose sum is σ = 3569330880. Its totient is φ = 1056098304.

The previous prime is 2105420969. The next prime is 2105421023. The reversal of 2105421015 is 5101245012.

It is not a de Polignac number, because 2105421015 - 2¹³ = 2105412823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2105420982 and 2105421000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 650421 + ... + 653649.

It is an arithmetic number, because the mean of its divisors is an integer number (111541590).

Almost surely, 2^2105421015 is an apocalyptic number.

2105421015 is a deficient number, since it is larger than the sum of its proper divisors (1463909865).

2105421015 is a wasteful number, since it uses less digits than its factorization.

2105421015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5811.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 2105421015 is about 45884.8669497908. The cubic root of 2105421015 is about 1281.6801291047.

Adding to 2105421015 its reverse (5101245012), we get a palindrome (7206666027).

The spelling of 2105421015 in words is "two billion, one hundred five million, four hundred twenty-one thousand, fifteen".