21211132103123 has 4 divisors (see below), whose sum is σ = 21286616559288. Its totient is φ = 21135647646960.

The previous prime is 21211132103111. The next prime is 21211132103149. The reversal of 21211132103123 is 32130123111212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21211132103123 - 2²² = 21211127908819 is a prime.

It is a super-2 number, since 2×21211132103123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211132102123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37742227661 + ... + 37742228222.

It is an arithmetic number, because the mean of its divisors is an integer number (5321654139822).

Almost surely, 2^{21211132103123} is an apocalyptic number.

21211132103123 is a deficient number, since it is larger than the sum of its proper divisors (75484456165).

21211132103123 is an equidigital number, since it uses as much as digits as its factorization.

21211132103123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75484456164.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21211132103123 its reverse (32130123111212), we get a palindrome (53341255214335).

The spelling of 21211132103123 in words is "twenty-one trillion, two hundred eleven billion, one hundred thirty-two million, one hundred three thousand, one hundred twenty-three".