2312100021 has 16 divisors (see below), whose sum is σ = 3843491328. Its totient is φ = 1201090800.

The previous prime is 2312099989. The next prime is 2312100061. The reversal of 2312100021 is 1200012132.

It is not a de Polignac number, because 2312100021 - 2⁵ = 2312099989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312100061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5004315 + ... + 5004776.

It is an arithmetic number, because the mean of its divisors is an integer number (240218208).

Almost surely, 2^2312100021 is an apocalyptic number.

2312100021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2312100021 is a deficient number, since it is larger than the sum of its proper divisors (1531391307).

2312100021 is a wasteful number, since it uses less digits than its factorization.

2312100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10009112.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2312100021 is about 48084.3011907213. The cubic root of 2312100021 is about 1322.3168716906.

Adding to 2312100021 its reverse (1200012132), we get a palindrome (3512112153).

The spelling of 2312100021 in words is "two billion, three hundred twelve million, one hundred thousand, twenty-one".