21213310037 has 2 divisors, whose sum is σ = 21213310038. Its totient is φ = 21213310036.

The previous prime is 21213309983. The next prime is 21213310043. The reversal of 21213310037 is 73001331212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14929418596 + 6283891441 = 122186^2 + 79271^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213310037 - 2⁶ = 21213309973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213309994 and 21213310021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213310537) 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, 10606655018 + 10606655019.

It is an arithmetic number, because the mean of its divisors is an integer number (10606655019).

Almost surely, 2^21213310037 is an apocalyptic number.

It is an amenable number.

21213310037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213310037 is an equidigital number, since it uses as much as digits as its factorization.

21213310037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 23.

Adding to 21213310037 its reverse (73001331212), we get a palindrome (94214641249).

The spelling of 21213310037 in words is "twenty-one billion, two hundred thirteen million, three hundred ten thousand, thirty-seven".