21203333131 has 2 divisors, whose sum is σ = 21203333132. Its totient is φ = 21203333130.

The previous prime is 21203333083. The next prime is 21203333143. The reversal of 21203333131 is 13133330212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203333131 is a prime.

It is a super-2 number, since 2×21203333131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21203333171) 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, 10601666565 + 10601666566.

It is an arithmetic number, because the mean of its divisors is an integer number (10601666566).

Almost surely, 2^21203333131 is an apocalyptic number.

21203333131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203333131 is an equidigital number, since it uses as much as digits as its factorization.

21203333131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21203333131 its reverse (13133330212), we get a palindrome (34336663343).

The spelling of 21203333131 in words is "twenty-one billion, two hundred three million, three hundred thirty-three thousand, one hundred thirty-one".