21213323223 has 16 divisors (see below), whose sum is σ = 29519598336. Its totient is φ = 13524857280.

The previous prime is 21213323221. The next prime is 21213323239. The reversal of 21213323223 is 32232331212.

It is not a de Polignac number, because 21213323223 - 2¹ = 21213323221 is a prime.

It is a super-2 number, since 2×21213323223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21213323193 and 21213323202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213323221) 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, 397236 + ... + 447462.

It is an arithmetic number, because the mean of its divisors is an integer number (1844974896).

Almost surely, 2^21213323223 is an apocalyptic number.

21213323223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21213323223 is a deficient number, since it is larger than the sum of its proper divisors (8306275113).

21213323223 is a wasteful number, since it uses less digits than its factorization.

21213323223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56374.

The product of its digits is 2592, while the sum is 24.

Adding to 21213323223 its reverse (32232331212), we get a palindrome (53445654435).

The spelling of 21213323223 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty-three thousand, two hundred twenty-three".