21210202112237 has 2 divisors, whose sum is σ = 21210202112238. Its totient is φ = 21210202112236.

The previous prime is 21210202112189. The next prime is 21210202112251. The reversal of 21210202112237 is 73221120201212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21194293083076 + 15909029161 = 4603726^2 + 126131^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210202112237 - 2¹⁶ = 21210202046701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210202112137) 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, 10605101056118 + 10605101056119.

It is an arithmetic number, because the mean of its divisors is an integer number (10605101056119).

Almost surely, 2^{21210202112237} is an apocalyptic number.

It is an amenable number.

21210202112237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210202112237 is an equidigital number, since it uses as much as digits as its factorization.

21210202112237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21210202112237 its reverse (73221120201212), we get a palindrome (94431322313449).

The spelling of 21210202112237 in words is "twenty-one trillion, two hundred ten billion, two hundred two million, one hundred twelve thousand, two hundred thirty-seven".