2100400312 has 48 divisors (see below), whose sum is σ = 4114239480. Its totient is φ = 1004538240.

The previous prime is 2100400283. The next prime is 2100400321. The reversal of 2100400312 is 2130040012.

It is a junction number, because it is equal to n+sod(n) for n = 2100400292 and 2100400301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1100463 + ... + 1102369.

Almost surely, 2^2100400312 is an apocalyptic number.

It is an amenable number.

2100400312 is a deficient number, since it is larger than the sum of its proper divisors (2013839168).

2100400312 is a wasteful number, since it uses less digits than its factorization.

2100400312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072 (or 2007 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2100400312 is about 45830.1245034311. The cubic root of 2100400312 is about 1280.6605298505.

Adding to 2100400312 its reverse (2130040012), we get a palindrome (4230440324).

The spelling of 2100400312 in words is "two billion, one hundred million, four hundred thousand, three hundred twelve".