21202223 has 8 divisors (see below), whose sum is σ = 24471840. Its totient is φ = 17992800.

The previous prime is 21202211. The next prime is 21202261. The reversal of 21202223 is 32220212.

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

It is not a de Polignac number, because 21202223 - 2¹⁰ = 21201199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202198 and 21202207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202273) 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, 14288 + ... + 15701.

It is an arithmetic number, because the mean of its divisors is an integer number (3058980).

Almost surely, 2^21202223 is an apocalyptic number.

21202223 is a deficient number, since it is larger than the sum of its proper divisors (3269617).

21202223 is a wasteful number, since it uses less digits than its factorization.

21202223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30097.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21202223 is about 4604.5871693345. The cubic root of 21202223 is about 276.7751741283.

Adding to 21202223 its reverse (32220212), we get a palindrome (53422435).

The spelling of 21202223 in words is "twenty-one million, two hundred two thousand, two hundred twenty-three".