21302213223 has 16 divisors (see below), whose sum is σ = 30029569920. Its totient is φ = 13394752416.

The previous prime is 21302213197. The next prime is 21302213243. The reversal of 21302213223 is 32231220312.

It is a happy number.

It is not a de Polignac number, because 21302213223 - 2³⁰ = 20228471399 is a prime.

It is a super-3 number, since 3×21302213223³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21302213223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302213243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 810240 + ... + 836117.

It is an arithmetic number, because the mean of its divisors is an integer number (1876848120).

Almost surely, 2^21302213223 is an apocalyptic number.

21302213223 is a deficient number, since it is larger than the sum of its proper divisors (8727356697).

21302213223 is a wasteful number, since it uses less digits than its factorization.

21302213223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646606.

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

Adding to 21302213223 its reverse (32231220312), we get a palindrome (53533433535).

The spelling of 21302213223 in words is "twenty-one billion, three hundred two million, two hundred thirteen thousand, two hundred twenty-three".