21121000331 has 2 divisors, whose sum is σ = 21121000332. Its totient is φ = 21121000330.

The previous prime is 21121000297. The next prime is 21121000361. The reversal of 21121000331 is 13300012112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121000331 - 2¹⁰ = 21120999307 is a prime.

It is a super-2 number, since 2×21121000331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21121000361) 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, 10560500165 + 10560500166.

It is an arithmetic number, because the mean of its divisors is an integer number (10560500166).

Almost surely, 2^21121000331 is an apocalyptic number.

21121000331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121000331 is an equidigital number, since it uses as much as digits as its factorization.

21121000331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21121000331 its reverse (13300012112), we get a palindrome (34421012443).

The spelling of 21121000331 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirty-one", and thus it is an aban number.