2145312100 has 36 divisors (see below), whose sum is σ = 4688849200. Its totient is φ = 851945760.

The previous prime is 2145312083. The next prime is 2145312107. The reversal of 2145312100 is 12135412.

It is not an unprimeable number, because it can be changed into a prime (2145312107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63270 + ... + 91069.

Almost surely, 2^2145312100 is an apocalyptic number.

2145312100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145312100 is an abundant number, since it is smaller than the sum of its proper divisors (2543537100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145312100 is a wasteful number, since it uses less digits than its factorization.

2145312100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154492 (or 154485 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2145312100 is about 46317.5139661014. The cubic root of 2145312100 is about 1289.7241362720.

Adding to 2145312100 its reverse (12135412), we get a palindrome (2157447512).

It can be divided in two parts, 2145312 and 100, that added together give a palindrome (2145412).

The spelling of 2145312100 in words is "two billion, one hundred forty-five million, three hundred twelve thousand, one hundred".