21230231012321 has 2 divisors, whose sum is σ = 21230231012322. Its totient is φ = 21230231012320.

The previous prime is 21230231012269. The next prime is 21230231012387. The reversal of 21230231012321 is 12321013203212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15632842837921 + 5597388174400 = 3953839^2 + 2365880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230231012321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230231012821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615115506160 + 10615115506161.

It is an arithmetic number, because the mean of its divisors is an integer number (10615115506161).

Almost surely, 2^{21230231012321} is an apocalyptic number.

It is an amenable number.

21230231012321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230231012321 is an equidigital number, since it uses as much as digits as its factorization.

21230231012321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21230231012321 its reverse (12321013203212), we get a palindrome (33551244215533).

The spelling of 21230231012321 in words is "twenty-one trillion, two hundred thirty billion, two hundred thirty-one million, twelve thousand, three hundred twenty-one".