21300029 has 2 divisors, whose sum is σ = 21300030. Its totient is φ = 21300028.

The previous prime is 21299987. The next prime is 21300061. The reversal of 21300029 is 92000312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 597529 = 4550^2 + 773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300029 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21300089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650014 + 10650015.

It is an arithmetic number, because the mean of its divisors is an integer number (10650015).

Almost surely, 2^21300029 is an apocalyptic number.

It is an amenable number.

21300029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300029 is an equidigital number, since it uses as much as digits as its factorization.

21300029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21300029 is about 4615.1954454822. The cubic root of 21300029 is about 277.2001099776.

It can be divided in two parts, 2 and 1300029, that added together give a palindrome (1300031).

The spelling of 21300029 in words is "twenty-one million, three hundred thousand, twenty-nine".