21000110012237 has 2 divisors, whose sum is σ = 21000110012238. Its totient is φ = 21000110012236.

The previous prime is 21000110012197. The next prime is 21000110012249. The reversal of 21000110012237 is 73221001100012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19642171938601 + 1357938073636 = 4431949^2 + 1165306^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000110012237 - 2¹⁰ = 21000110011213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000110012267) 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, 10500055006118 + 10500055006119.

It is an arithmetic number, because the mean of its divisors is an integer number (10500055006119).

Almost surely, 2^{21000110012237} is an apocalyptic number.

It is an amenable number.

21000110012237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000110012237 is an equidigital number, since it uses as much as digits as its factorization.

21000110012237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 21000110012237 its reverse (73221001100012), we get a palindrome (94221111112249).

The spelling of 21000110012237 in words is "twenty-one trillion, one hundred ten million, twelve thousand, two hundred thirty-seven".