21022118101 has 2 divisors, whose sum is σ = 21022118102. Its totient is φ = 21022118100.

The previous prime is 21022118093. The next prime is 21022118147. The reversal of 21022118101 is 10181122012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20784988900 + 237129201 = 144170^2 + 15399^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022118101 - 2³ = 21022118093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022118191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511059050 + 10511059051.

It is an arithmetic number, because the mean of its divisors is an integer number (10511059051).

Almost surely, 2^21022118101 is an apocalyptic number.

It is an amenable number.

21022118101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022118101 is an equidigital number, since it uses as much as digits as its factorization.

21022118101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

The spelling of 21022118101 in words is "twenty-one billion, twenty-two million, one hundred eighteen thousand, one hundred one".