21232232123 has 4 divisors (see below), whose sum is σ = 21233878248. Its totient is φ = 21230586000.

The previous prime is 21232232117. The next prime is 21232232143. The reversal of 21232232123 is 32123223212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232232123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232232143) 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, 803561 + ... + 829562.

It is an arithmetic number, because the mean of its divisors is an integer number (5308469562).

Almost surely, 2^21232232123 is an apocalyptic number.

21232232123 is a deficient number, since it is larger than the sum of its proper divisors (1646125).

21232232123 is a wasteful number, since it uses less digits than its factorization.

21232232123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646124.

The product of its digits is 1728, while the sum is 23.

Adding to 21232232123 its reverse (32123223212), we get a palindrome (53355455335).

It can be divided in two parts, 2123223212 and 3, that multiplied together give a palindrome (6369669636).

The spelling of 21232232123 in words is "twenty-one billion, two hundred thirty-two million, two hundred thirty-two thousand, one hundred twenty-three".