21231242223 has 8 divisors (see below), whose sum is σ = 28312964736. Its totient is φ = 14151840600.

The previous prime is 21231242189. The next prime is 21231242231. The reversal of 21231242223 is 32224213212.

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

It is not a de Polignac number, because 21231242223 - 2⁶ = 21231242159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231242193 and 21231242202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231242243) 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, 558763 + ... + 595548.

It is an arithmetic number, because the mean of its divisors is an integer number (3539120592).

Almost surely, 2^21231242223 is an apocalyptic number.

21231242223 is a deficient number, since it is larger than the sum of its proper divisors (7081722513).

21231242223 is a wasteful number, since it uses less digits than its factorization.

21231242223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160445.

The product of its digits is 2304, while the sum is 24.

Adding to 21231242223 its reverse (32224213212), we get a palindrome (53455455435).

The spelling of 21231242223 in words is "twenty-one billion, two hundred thirty-one million, two hundred forty-two thousand, two hundred twenty-three".