2100120646 has 16 divisors (see below), whose sum is σ = 3464685504. Its totient is φ = 948662784.

The previous prime is 2100120623. The next prime is 2100120647. The reversal of 2100120646 is 6460210012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100120647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 858075 + ... + 860518.

It is an arithmetic number, because the mean of its divisors is an integer number (216542844).

Almost surely, 2^2100120646 is an apocalyptic number.

2100120646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2100120646 is a deficient number, since it is larger than the sum of its proper divisors (1364564858).

2100120646 is a wasteful number, since it uses less digits than its factorization.

2100120646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718655.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 2100120646 is about 45827.0732864319. The cubic root of 2100120646 is about 1280.6036878122.

Adding to 2100120646 its reverse (6460210012), we get a palindrome (8560330658).

The spelling of 2100120646 in words is "two billion, one hundred million, one hundred twenty thousand, six hundred forty-six".