210100100222921 has 2 divisors, whose sum is σ = 210100100222922. Its totient is φ = 210100100222920.

The previous prime is 210100100222897. The next prime is 210100100222923. The reversal of 210100100222921 is 129222001001012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172761450015625 + 37338650207296 = 13143875^2 + 6110536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210100100222921 is a prime.

It is a super-2 number, since 2×210100100222921² (a number of 29 digits) contains 22 as substring.

Together with 210100100222923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (210100100222923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050050111460 + 105050050111461.

It is an arithmetic number, because the mean of its divisors is an integer number (105050050111461).

Almost surely, 2^{210100100222921} is an apocalyptic number.

It is an amenable number.

210100100222921 is a deficient number, since it is larger than the sum of its proper divisors (1).

210100100222921 is an equidigital number, since it uses as much as digits as its factorization.

210100100222921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 210100100222921 its reverse (129222001001012), we get a palindrome (339322101223933).

The spelling of 210100100222921 in words is "two hundred ten trillion, one hundred billion, one hundred million, two hundred twenty-two thousand, nine hundred twenty-one".