231303224021 has 2 divisors, whose sum is σ = 231303224022. Its totient is φ = 231303224020.

The previous prime is 231303223961. The next prime is 231303224027. The reversal of 231303224021 is 120422303132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171322315921 + 59980908100 = 413911^2 + 244910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231303224021 is a prime.

It is a super-2 number, since 2×231303224021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231303224027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115651612010 + 115651612011.

It is an arithmetic number, because the mean of its divisors is an integer number (115651612011).

Almost surely, 2^231303224021 is an apocalyptic number.

It is an amenable number.

231303224021 is a deficient number, since it is larger than the sum of its proper divisors (1).

231303224021 is an equidigital number, since it uses as much as digits as its factorization.

231303224021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 231303224021 its reverse (120422303132), we get a palindrome (351725527153).

The spelling of 231303224021 in words is "two hundred thirty-one billion, three hundred three million, two hundred twenty-four thousand, twenty-one".