231024421021 has 2 divisors, whose sum is σ = 231024421022. Its totient is φ = 231024421020.

The previous prime is 231024420941. The next prime is 231024421031. The reversal of 231024421021 is 120124420132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165820798521 + 65203622500 = 407211^2 + 255350^2 .

It is a cyclic number.

It is not a de Polignac number, because 231024421021 - 2²³ = 231016032413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231024420983 and 231024421001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231024421031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115512210510 + 115512210511.

It is an arithmetic number, because the mean of its divisors is an integer number (115512210511).

Almost surely, 2^231024421021 is an apocalyptic number.

It is an amenable number.

231024421021 is a deficient number, since it is larger than the sum of its proper divisors (1).

231024421021 is an equidigital number, since it uses as much as digits as its factorization.

231024421021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 231024421021 its reverse (120124420132), we get a palindrome (351148841153).

The spelling of 231024421021 in words is "two hundred thirty-one billion, twenty-four million, four hundred twenty-one thousand, twenty-one".