21102101223 has 16 divisors (see below), whose sum is σ = 32811820800. Its totient is φ = 12058342968.

The previous prime is 21102101201. The next prime is 21102101269. The reversal of 21102101223 is 32210120112.

It is not a de Polignac number, because 21102101223 - 2⁶ = 21102101159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102100223) 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 in 15 ways as a sum of consecutive naturals, for example, 10252665 + ... + 10254722.

It is an arithmetic number, because the mean of its divisors is an integer number (2050738800).

Almost surely, 2^21102101223 is an apocalyptic number.

21102101223 is a deficient number, since it is larger than the sum of its proper divisors (11709719577).

21102101223 is an equidigital number, since it uses as much as digits as its factorization.

21102101223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20507411 (or 20507397 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21102101223 its reverse (32210120112), we get a palindrome (53312221335).

The spelling of 21102101223 in words is "twenty-one billion, one hundred two million, one hundred one thousand, two hundred twenty-three".