21266029 has 2 divisors, whose sum is σ = 21266030. Its totient is φ = 21266028.

The previous prime is 21266017. The next prime is 21266033. The reversal of 21266029 is 92066212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12236004 + 9030025 = 3498^2 + 3005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21266029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21265988 and 21266006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21266039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10633014 + 10633015.

It is an arithmetic number, because the mean of its divisors is an integer number (10633015).

Almost surely, 2^21266029 is an apocalyptic number.

It is an amenable number.

21266029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21266029 is an equidigital number, since it uses as much as digits as its factorization.

21266029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 21266029 is about 4611.5104900672. The cubic root of 21266029 is about 277.0525386144.

The spelling of 21266029 in words is "twenty-one million, two hundred sixty-six thousand, twenty-nine".