2331321821 has 2 divisors, whose sum is σ = 2331321822. Its totient is φ = 2331321820.

The previous prime is 2331321781. The next prime is 2331321833. The reversal of 2331321821 is 1281231332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1228152025 + 1103169796 = 35045^2 + 33214^2 .

It is a cyclic number.

It is not a de Polignac number, because 2331321821 - 2¹⁸ = 2331059677 is a prime.

It is a super-2 number, since 2×2331321821² = 10870122866141512082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2331321721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1165660910 + 1165660911.

It is an arithmetic number, because the mean of its divisors is an integer number (1165660911).

Almost surely, 2^2331321821 is an apocalyptic number.

It is an amenable number.

2331321821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2331321821 is an equidigital number, since it uses as much as digits as its factorization.

2331321821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 2331321821 is about 48283.7635339251. The cubic root of 2331321821 is about 1325.9711538822.

The spelling of 2331321821 in words is "two billion, three hundred thirty-one million, three hundred twenty-one thousand, eight hundred twenty-one".