21103232123 has 8 divisors (see below), whose sum is σ = 21513299328. Its totient is φ = 20693605504.

The previous prime is 21103232107. The next prime is 21103232141. The reversal of 21103232123 is 32123230112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21103232123 - 2⁴ = 21103232107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103232095 and 21103232104.

It is not an unprimeable number, because it can be changed into a prime (21103232023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12590 + ... + 205827.

It is an arithmetic number, because the mean of its divisors is an integer number (2689162416).

Almost surely, 2^21103232123 is an apocalyptic number.

21103232123 is a deficient number, since it is larger than the sum of its proper divisors (410067205).

21103232123 is a wasteful number, since it uses less digits than its factorization.

21103232123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220293.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21103232123 its reverse (32123230112), we get a palindrome (53226462235).

The spelling of 21103232123 in words is "twenty-one billion, one hundred three million, two hundred thirty-two thousand, one hundred twenty-three".