21223023229 has 2 divisors, whose sum is σ = 21223023230. Its totient is φ = 21223023228.

The previous prime is 21223023137. The next prime is 21223023259. The reversal of 21223023229 is 92232032212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12932920729 + 8290102500 = 113723^2 + 91050^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223023229 - 2¹⁵ = 21222990461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21223023197 and 21223023206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223023259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611511614 + 10611511615.

It is an arithmetic number, because the mean of its divisors is an integer number (10611511615).

Almost surely, 2^21223023229 is an apocalyptic number.

It is an amenable number.

21223023229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223023229 is an equidigital number, since it uses as much as digits as its factorization.

21223023229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 21223023229 in words is "twenty-one billion, two hundred twenty-three million, twenty-three thousand, two hundred twenty-nine".