21333013237 has 2 divisors, whose sum is σ = 21333013238. Its totient is φ = 21333013236.

The previous prime is 21333013231. The next prime is 21333013243. The reversal of 21333013237 is 73231033312.

It is a balanced prime because it is at equal distance from previous prime (21333013231) and next prime (21333013243).

It can be written as a sum of positive squares in only one way, i.e., 11099465316 + 10233547921 = 105354^2 + 101161^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333013237 - 2²⁷ = 21198795509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21333013231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666506618 + 10666506619.

It is an arithmetic number, because the mean of its divisors is an integer number (10666506619).

Almost surely, 2^21333013237 is an apocalyptic number.

It is an amenable number.

21333013237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333013237 is an equidigital number, since it uses as much as digits as its factorization.

21333013237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 28.

Adding to 21333013237 its reverse (73231033312), we get a palindrome (94564046549).

The spelling of 21333013237 in words is "twenty-one billion, three hundred thirty-three million, thirteen thousand, two hundred thirty-seven".