21210111337 has 2 divisors, whose sum is σ = 21210111338. Its totient is φ = 21210111336.

The previous prime is 21210111311. The next prime is 21210111341. The reversal of 21210111337 is 73311101212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13029994201 + 8180117136 = 114149^2 + 90444^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210111337 - 2¹⁵ = 21210078569 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210111037) 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, 10605055668 + 10605055669.

It is an arithmetic number, because the mean of its divisors is an integer number (10605055669).

Almost surely, 2^21210111337 is an apocalyptic number.

It is an amenable number.

21210111337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210111337 is an equidigital number, since it uses as much as digits as its factorization.

21210111337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

Adding to 21210111337 its reverse (73311101212), we get a palindrome (94521212549).

The spelling of 21210111337 in words is "twenty-one billion, two hundred ten million, one hundred eleven thousand, three hundred thirty-seven".