2312420021 has 4 divisors (see below), whose sum is σ = 2316085344. Its totient is φ = 2308754700.

The previous prime is 2312420017. The next prime is 2312420027. The reversal of 2312420021 is 1200242132.

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 not a de Polignac number, because 2312420021 - 2² = 2312420017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312420027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1831715 + ... + 1832976.

It is an arithmetic number, because the mean of its divisors is an integer number (579021336).

Almost surely, 2^2312420021 is an apocalyptic number.

It is an amenable number.

2312420021 is a deficient number, since it is larger than the sum of its proper divisors (3665323).

2312420021 is an equidigital number, since it uses as much as digits as its factorization.

2312420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3665322.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2312420021 is about 48087.6285649438. The cubic root of 2312420021 is about 1322.3778727828.

Adding to 2312420021 its reverse (1200242132), we get a palindrome (3512662153).

The spelling of 2312420021 in words is "two billion, three hundred twelve million, four hundred twenty thousand, twenty-one".