2312240821 has 4 divisors (see below), whose sum is σ = 2522444544. Its totient is φ = 2102037100.

The previous prime is 2312240813. The next prime is 2312240837. The reversal of 2312240821 is 1280422132.

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 2312240821 - 2³ = 2312240813 is a prime.

It is a super-2 number, since 2×2312240821² = 10692915228597508082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312240921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105101845 + ... + 105101866.

It is an arithmetic number, because the mean of its divisors is an integer number (630611136).

Almost surely, 2^2312240821 is an apocalyptic number.

It is an amenable number.

2312240821 is a deficient number, since it is larger than the sum of its proper divisors (210203723).

2312240821 is a wasteful number, since it uses less digits than its factorization.

2312240821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210203722.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 2312240821 is about 48085.7652637452. The cubic root of 2312240821 is about 1322.3437128646.

Adding to 2312240821 its reverse (1280422132), we get a palindrome (3592662953).

The spelling of 2312240821 in words is "two billion, three hundred twelve million, two hundred forty thousand, eight hundred twenty-one".