21062431331 has 2 divisors, whose sum is σ = 21062431332. Its totient is φ = 21062431330.

The previous prime is 21062431289. The next prime is 21062431381. The reversal of 21062431331 is 13313426012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21062431331 - 2⁶ = 21062431267 is a prime.

It is a super-2 number, since 2×21062431331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21062431331.

It is not a weakly prime, because it can be changed into another prime (21062431381) 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, 10531215665 + 10531215666.

It is an arithmetic number, because the mean of its divisors is an integer number (10531215666).

Almost surely, 2^21062431331 is an apocalyptic number.

21062431331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21062431331 is an equidigital number, since it uses as much as digits as its factorization.

21062431331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21062431331 its reverse (13313426012), we get a palindrome (34375857343).

The spelling of 21062431331 in words is "twenty-one billion, sixty-two million, four hundred thirty-one thousand, three hundred thirty-one".