210100110721 has 2 divisors, whose sum is σ = 210100110722. Its totient is φ = 210100110720.

The previous prime is 210100110713. The next prime is 210100110761. The reversal of 210100110721 is 127011001012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145820114496 + 64279996225 = 381864^2 + 253535^2 .

It is a cyclic number.

It is not a de Polignac number, because 210100110721 - 2³ = 210100110713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210100110695 and 210100110704.

It is not a weakly prime, because it can be changed into another prime (210100110761) 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, 105050055360 + 105050055361.

It is an arithmetic number, because the mean of its divisors is an integer number (105050055361).

Almost surely, 2^210100110721 is an apocalyptic number.

It is an amenable number.

210100110721 is a deficient number, since it is larger than the sum of its proper divisors (1).

210100110721 is an equidigital number, since it uses as much as digits as its factorization.

210100110721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 16.

Adding to 210100110721 its reverse (127011001012), we get a palindrome (337111111733).

The spelling of 210100110721 in words is "two hundred ten billion, one hundred million, one hundred ten thousand, seven hundred twenty-one".