21282629 has 2 divisors, whose sum is σ = 21282630. Its totient is φ = 21282628.

The previous prime is 21282601. The next prime is 21282643. The reversal of 21282629 is 92628212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20232004 + 1050625 = 4498^2 + 1025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21282629 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21282595 and 21282604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21282529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10641314 + 10641315.

It is an arithmetic number, because the mean of its divisors is an integer number (10641315).

Almost surely, 2^21282629 is an apocalyptic number.

It is an amenable number.

21282629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21282629 is an equidigital number, since it uses as much as digits as its factorization.

21282629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 21282629 is about 4613.3099830816. The cubic root of 21282629 is about 277.1246077973.

The spelling of 21282629 in words is "twenty-one million, two hundred eighty-two thousand, six hundred twenty-nine".