21323510029 has 2 divisors, whose sum is σ = 21323510030. Its totient is φ = 21323510028.

The previous prime is 21323510011. The next prime is 21323510081. The reversal of 21323510029 is 92001532312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21315416004 + 8094025 = 145998^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323510029 - 2⁷ = 21323509901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21323509979 and 21323510006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323510009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661755014 + 10661755015.

It is an arithmetic number, because the mean of its divisors is an integer number (10661755015).

Almost surely, 2^21323510029 is an apocalyptic number.

It is an amenable number.

21323510029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323510029 is an equidigital number, since it uses as much as digits as its factorization.

21323510029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The spelling of 21323510029 in words is "twenty-one billion, three hundred twenty-three million, five hundred ten thousand, twenty-nine".