21040032331 has 2 divisors, whose sum is σ = 21040032332. Its totient is φ = 21040032330.

The previous prime is 21040032313. The next prime is 21040032367. The reversal of 21040032331 is 13323004012.

Together with previous prime (21040032313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21040032331 - 2¹³ = 21040024139 is a prime.

It is a super-2 number, since 2×21040032331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21040032299 and 21040032308.

It is not a weakly prime, because it can be changed into another prime (21040032131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520016165 + 10520016166.

It is an arithmetic number, because the mean of its divisors is an integer number (10520016166).

Almost surely, 2^21040032331 is an apocalyptic number.

21040032331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040032331 is an equidigital number, since it uses as much as digits as its factorization.

21040032331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21040032331 its reverse (13323004012), we get a palindrome (34363036343).

The spelling of 21040032331 in words is "twenty-one billion, forty million, thirty-two thousand, three hundred thirty-one".