2312321021 has 4 divisors (see below), whose sum is σ = 2312545344. Its totient is φ = 2312096700.

The previous prime is 2312320931. The next prime is 2312321027. The reversal of 2312321021 is 1201232132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2312321021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312321027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95915 + ... + 117576.

It is an arithmetic number, because the mean of its divisors is an integer number (578136336).

Almost surely, 2^2312321021 is an apocalyptic number.

It is an amenable number.

2312321021 is a deficient number, since it is larger than the sum of its proper divisors (224323).

2312321021 is a wasteful number, since it uses less digits than its factorization.

2312321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224322.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2312321021 is about 48086.5991831404. The cubic root of 2312321021 is about 1322.3590011711.

Adding to 2312321021 its reverse (1201232132), we get a palindrome (3513553153).

Subtracting from 2312321021 its reverse (1201232132), we obtain a square (1111088889 = 33333²).

It can be divided in two parts, 23123 and 21021, that added together give a palindrome (44144).

The spelling of 2312321021 in words is "two billion, three hundred twelve million, three hundred twenty-one thousand, twenty-one".