21230311223 has 8 divisors (see below), whose sum is σ = 23163626640. Its totient is φ = 19297543680.

The previous prime is 21230311217. The next prime is 21230311237. The reversal of 21230311223 is 32211303212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230311223 is a prime.

It is a super-2 number, since 2×21230311223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21230311195 and 21230311204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230314223) 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, 53738 + ... + 212951.

It is an arithmetic number, because the mean of its divisors is an integer number (2895453330).

Almost surely, 2^21230311223 is an apocalyptic number.

21230311223 is a deficient number, since it is larger than the sum of its proper divisors (1933315417).

21230311223 is a wasteful number, since it uses less digits than its factorization.

21230311223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273937.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21230311223 its reverse (32211303212), we get a palindrome (53441614435).

The spelling of 21230311223 in words is "twenty-one billion, two hundred thirty million, three hundred eleven thousand, two hundred twenty-three".