21200669 has 4 divisors (see below), whose sum is σ = 24229344. Its totient is φ = 18171996.

The previous prime is 21200639. The next prime is 21200681. The reversal of 21200669 is 96600212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21200669 - 2¹² = 21196573 is a prime.

It is a super-2 number, since 2×21200669² = 898936732095122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514327 + ... + 1514340.

It is an arithmetic number, because the mean of its divisors is an integer number (6057336).

Almost surely, 2^21200669 is an apocalyptic number.

It is an amenable number.

21200669 is a deficient number, since it is larger than the sum of its proper divisors (3028675).

21200669 is an equidigital number, since it uses as much as digits as its factorization.

21200669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028674.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21200669 is about 4604.4184214730. The cubic root of 21200669 is about 276.7684119580.

The spelling of 21200669 in words is "twenty-one million, two hundred thousand, six hundred sixty-nine".