21100121223 has 32 divisors (see below), whose sum is σ = 29930765760. Its totient is φ = 13198295040.

The previous prime is 21100121213. The next prime is 21100121227. The reversal of 21100121223 is 32212100112.

It is not a de Polignac number, because 21100121223 - 2⁸ = 21100120967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100121227) 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 31 ways as a sum of consecutive naturals, for example, 905211 + ... + 928227.

It is an arithmetic number, because the mean of its divisors is an integer number (935336430).

Almost surely, 2^21100121223 is an apocalyptic number.

21100121223 is a deficient number, since it is larger than the sum of its proper divisors (8830644537).

21100121223 is a wasteful number, since it uses less digits than its factorization.

21100121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23347.

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

Adding to 21100121223 its reverse (32212100112), we get a palindrome (53312221335).

The spelling of 21100121223 in words is "twenty-one billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-three".