21101223112123 has 32 divisors (see below), whose sum is σ = 26673444495360. Its totient is φ = 16217248610880.

The previous prime is 21101223112117. The next prime is 21101223112129. The reversal of 21101223112123 is 32121132210112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21101223112117) and next prime (21101223112129).

It is not a de Polignac number, because 21101223112123 - 2³³ = 21092633177531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101223112094 and 21101223112103.

It is not an unprimeable number, because it can be changed into a prime (21101223112129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29602086 + ... + 30306532.

It is an arithmetic number, because the mean of its divisors is an integer number (833545140480).

Almost surely, 2^{21101223112123} is an apocalyptic number.

21101223112123 is a deficient number, since it is larger than the sum of its proper divisors (5572221383237).

21101223112123 is an frugal number, since it uses more digits than its factorization.

21101223112123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704684 (or 704538 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21101223112123 its reverse (32121132210112), we get a palindrome (53222355322235).

The spelling of 21101223112123 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-three million, one hundred twelve thousand, one hundred twenty-three".