21232031223 has 32 divisors (see below), whose sum is σ = 31495475200. Its totient is φ = 12634341120.

The previous prime is 21232031167. The next prime is 21232031269. The reversal of 21232031223 is 32213023212.

It is a happy number.

It is not a de Polignac number, because 21232031223 - 2⁶ = 21232031159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21232031223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232031273) 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, 1685115 + ... + 1697667.

It is an arithmetic number, because the mean of its divisors is an integer number (984233600).

Almost surely, 2^21232031223 is an apocalyptic number.

21232031223 is a deficient number, since it is larger than the sum of its proper divisors (10263443977).

21232031223 is a wasteful number, since it uses less digits than its factorization.

21232031223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13999.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21232031223 its reverse (32213023212), we get a palindrome (53445054435).

The spelling of 21232031223 in words is "twenty-one billion, two hundred thirty-two million, thirty-one thousand, two hundred twenty-three".