21130669 has 4 divisors (see below), whose sum is σ = 24149344. Its totient is φ = 18111996.

The previous prime is 21130667. The next prime is 21130699. The reversal of 21130669 is 96603112.

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 not a de Polignac number, because 21130669 - 2¹ = 21130667 is a prime.

It is a super-2 number, since 2×21130669² = 893010344775122, 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 (21130667) 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 in 3 ways as a sum of consecutive naturals, for example, 1509327 + ... + 1509340.

It is an arithmetic number, because the mean of its divisors is an integer number (6037336).

Almost surely, 2^21130669 is an apocalyptic number.

It is an amenable number.

21130669 is a deficient number, since it is larger than the sum of its proper divisors (3018675).

21130669 is an equidigital number, since it uses as much as digits as its factorization.

21130669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3018674.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 21130669 is about 4596.8107422429. The cubic root of 21130669 is about 276.4634663811.

The spelling of 21130669 in words is "twenty-one million, one hundred thirty thousand, six hundred sixty-nine".