21300669 has 12 divisors (see below), whose sum is σ = 33134556. Its totient is φ = 13108032.

The previous prime is 21300659. The next prime is 21300673. The reversal of 21300669 is 96600312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4995225 + 16305444 = 2235^2 + 4038^2 .

It is not a de Polignac number, because 21300669 - 2¹⁷ = 21169597 is a prime.

It is a super-2 number, since 2×21300669² = 907436999695122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90912 + ... + 91145.

It is an arithmetic number, because the mean of its divisors is an integer number (2761213).

Almost surely, 2^21300669 is an apocalyptic number.

It is an amenable number.

21300669 is a deficient number, since it is larger than the sum of its proper divisors (11833887).

21300669 is a wasteful number, since it uses less digits than its factorization.

21300669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182076 (or 182073 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 21300669 is about 4615.2647811366. The cubic root of 21300669 is about 277.2028862852.

The spelling of 21300669 in words is "twenty-one million, three hundred thousand, six hundred sixty-nine".