21002223101 has 2 divisors, whose sum is σ = 21002223102. Its totient is φ = 21002223100.

The previous prime is 21002223091. The next prime is 21002223149. The reversal of 21002223101 is 10132220012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16570125625 + 4432097476 = 128725^2 + 66574^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002223101 - 2⁶ = 21002223037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002223191) 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, 10501111550 + 10501111551.

It is an arithmetic number, because the mean of its divisors is an integer number (10501111551).

Almost surely, 2^21002223101 is an apocalyptic number.

It is an amenable number.

21002223101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002223101 is an equidigital number, since it uses as much as digits as its factorization.

21002223101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21002223101 its reverse (10132220012), we get a palindrome (31134443113).

The spelling of 21002223101 in words is "twenty-one billion, two million, two hundred twenty-three thousand, one hundred one".