21211322223 has 96 divisors (see below), whose sum is σ = 37972440576. Its totient is φ = 10411898112.

The previous prime is 21211322203. The next prime is 21211322273. The reversal of 21211322223 is 32222311212.

It is not a de Polignac number, because 21211322223 - 2¹⁰ = 21211321199 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 21211322223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211322203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1619740 + ... + 1632782.

It is an arithmetic number, because the mean of its divisors is an integer number (395546256).

Almost surely, 2^21211322223 is an apocalyptic number.

21211322223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21211322223 is a deficient number, since it is larger than the sum of its proper divisors (16761118353).

21211322223 is a wasteful number, since it uses less digits than its factorization.

21211322223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13133 (or 13126 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

Adding to 21211322223 its reverse (32222311212), we get a palindrome (53433633435).

The spelling of 21211322223 in words is "twenty-one billion, two hundred eleven million, three hundred twenty-two thousand, two hundred twenty-three".