2100040405906 has 16 divisors (see below), whose sum is σ = 3194834797440. Its totient is φ = 1035099243360.

The previous prime is 2100040405891. The next prime is 2100040405927. The reversal of 2100040405906 is 6095040400012.

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, 180310 + ... + 2057326.

It is an arithmetic number, because the mean of its divisors is an integer number (199677174840).

Almost surely, 2^{2100040405906} is an apocalyptic number.

2100040405906 is a deficient number, since it is larger than the sum of its proper divisors (1094794391534).

2100040405906 is a wasteful number, since it uses less digits than its factorization.

2100040405906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884969.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 2100040405906 its reverse (6095040400012), we get a palindrome (8195080805918).

The spelling of 2100040405906 in words is "two trillion, one hundred billion, forty million, four hundred five thousand, nine hundred six".