2105213906 has 16 divisors (see below), whose sum is σ = 3271829760. Its totient is φ = 1014857040.

The previous prime is 2105213879. The next prime is 2105213911. The reversal of 2105213906 is 6093125012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46436 + ... + 79791.

It is an arithmetic number, because the mean of its divisors is an integer number (204489360).

Almost surely, 2^2105213906 is an apocalyptic number.

2105213906 is a deficient number, since it is larger than the sum of its proper divisors (1166615854).

2105213906 is a wasteful number, since it uses less digits than its factorization.

2105213906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126529.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 2105213906 is about 45882.6100608934. The cubic root of 2105213906 is about 1281.6381016919.

Adding to 2105213906 its reverse (6093125012), we get a palindrome (8198338918).

The spelling of 2105213906 in words is "two billion, one hundred five million, two hundred thirteen thousand, nine hundred six".