21111201210223 has 16 divisors (see below), whose sum is σ = 21325644748800. Its totient is φ = 20897254317184.

The previous prime is 21111201210193. The next prime is 21111201210241. The reversal of 21111201210223 is 32201210211112.

It is a cyclic number.

It is not a de Polignac number, because 21111201210223 - 2⁵ = 21111201210191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111201210223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111201210623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429073578 + ... + 429122776.

It is an arithmetic number, because the mean of its divisors is an integer number (1332852796800).

Almost surely, 2^{21111201210223} is an apocalyptic number.

21111201210223 is a deficient number, since it is larger than the sum of its proper divisors (214443538577).

21111201210223 is a wasteful number, since it uses less digits than its factorization.

21111201210223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54158.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21111201210223 its reverse (32201210211112), we get a palindrome (53312411421335).

The spelling of 21111201210223 in words is "twenty-one trillion, one hundred eleven billion, two hundred one million, two hundred ten thousand, two hundred twenty-three".