21120306331 has 2 divisors, whose sum is σ = 21120306332. Its totient is φ = 21120306330.

The previous prime is 21120306323. The next prime is 21120306353. The reversal of 21120306331 is 13360302112.

It is an a-pointer prime, because the next prime (21120306353) can be obtained adding 21120306331 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120306331 - 2³ = 21120306323 is a prime.

It is a super-2 number, since 2×21120306331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21121306331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560153165 + 10560153166.

It is an arithmetic number, because the mean of its divisors is an integer number (10560153166).

Almost surely, 2^21120306331 is an apocalyptic number.

21120306331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120306331 is an equidigital number, since it uses as much as digits as its factorization.

21120306331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21120306331 its reverse (13360302112), we get a palindrome (34480608443).

The spelling of 21120306331 in words is "twenty-one billion, one hundred twenty million, three hundred six thousand, three hundred thirty-one".