21202669 has 2 divisors, whose sum is σ = 21202670. Its totient is φ = 21202668.

The previous prime is 21202663. The next prime is 21202681. The reversal of 21202669 is 96620212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19027044 + 2175625 = 4362^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202669 - 2⁵ = 21202637 is a prime.

It is a super-2 number, since 2×21202669² = 899106345447122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202663) 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, 10601334 + 10601335.

It is an arithmetic number, because the mean of its divisors is an integer number (10601335).

Almost surely, 2^21202669 is an apocalyptic number.

It is an amenable number.

21202669 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202669 is an equidigital number, since it uses as much as digits as its factorization.

21202669 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21202669 is about 4604.6355990458. The cubic root of 21202669 is about 276.7771148189. Note that the first 3 decimals are identical.

The spelling of 21202669 in words is "twenty-one million, two hundred two thousand, six hundred sixty-nine".