21231231083 has 2 divisors, whose sum is σ = 21231231084. Its totient is φ = 21231231082.

The previous prime is 21231231041. The next prime is 21231231089. The reversal of 21231231083 is 38013213212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21231231083 - 2⁶ = 21231231019 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21231231089) 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 as a sum of consecutive naturals, namely, 10615615541 + 10615615542.

It is an arithmetic number, because the mean of its divisors is an integer number (10615615542).

Almost surely, 2^21231231083 is an apocalyptic number.

21231231083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231231083 is an equidigital number, since it uses as much as digits as its factorization.

21231231083 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21231231083 its reverse (38013213212), we get a palindrome (59244444295).

The spelling of 21231231083 in words is "twenty-one billion, two hundred thirty-one million, two hundred thirty-one thousand, eighty-three".