21300131233 has 2 divisors, whose sum is σ = 21300131234. Its totient is φ = 21300131232.

The previous prime is 21300131173. The next prime is 21300131239. The reversal of 21300131233 is 33213100312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17873550864 + 3426580369 = 133692^2 + 58537^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300131233 - 2²⁵ = 21266576801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21300131233.

It is not a weakly prime, because it can be changed into another prime (21300131239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650065616 + 10650065617.

It is an arithmetic number, because the mean of its divisors is an integer number (10650065617).

Almost surely, 2^21300131233 is an apocalyptic number.

It is an amenable number.

21300131233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300131233 is an equidigital number, since it uses as much as digits as its factorization.

21300131233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21300131233 its reverse (33213100312), we get a palindrome (54513231545).

The spelling of 21300131233 in words is "twenty-one billion, three hundred million, one hundred thirty-one thousand, two hundred thirty-three".