221000212100237 has 2 divisors, whose sum is σ = 221000212100238. Its totient is φ = 221000212100236.

The previous prime is 221000212100201. The next prime is 221000212100257. The reversal of 221000212100237 is 732001212000122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193698866045476 + 27301346054761 = 13917574^2 + 5225069^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000212100237 - 2²⁸ = 220999943664781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221000212100257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500106050118 + 110500106050119.

It is an arithmetic number, because the mean of its divisors is an integer number (110500106050119).

Almost surely, 2^{221000212100237} is an apocalyptic number.

It is an amenable number.

221000212100237 is a deficient number, since it is larger than the sum of its proper divisors (1).

221000212100237 is an equidigital number, since it uses as much as digits as its factorization.

221000212100237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 221000212100237 its reverse (732001212000122), we get a palindrome (953001424100359).

The spelling of 221000212100237 in words is "two hundred twenty-one trillion, two hundred twelve million, one hundred thousand, two hundred thirty-seven".