21032213223 has 16 divisors (see below), whose sum is σ = 32060618496. Its totient is φ = 12014083200.

The previous prime is 21032213207. The next prime is 21032213227. The reversal of 21032213223 is 32231223012.

It is a happy number.

It is not a de Polignac number, because 21032213223 - 2⁴ = 21032213207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21032213223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032213227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119961 + ... + 237602.

It is an arithmetic number, because the mean of its divisors is an integer number (2003788656).

Almost surely, 2^21032213223 is an apocalyptic number.

21032213223 is a deficient number, since it is larger than the sum of its proper divisors (11028405273).

21032213223 is a wasteful number, since it uses less digits than its factorization.

21032213223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360374.

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

Adding to 21032213223 its reverse (32231223012), we get a palindrome (53263436235).

The spelling of 21032213223 in words is "twenty-one billion, thirty-two million, two hundred thirteen thousand, two hundred twenty-three".