21669327 has 6 divisors (see below), whose sum is σ = 31300152. Its totient is φ = 14446212.

The previous prime is 21669317. The next prime is 21669331. The reversal of 21669327 is 72396612.

It is not a de Polignac number, because 21669327 - 2⁷ = 21669199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21669291 and 21669300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21669317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1203843 + ... + 1203860.

It is an arithmetic number, because the mean of its divisors is an integer number (5216692).

Almost surely, 2^21669327 is an apocalyptic number.

21669327 is a deficient number, since it is larger than the sum of its proper divisors (9630825).

21669327 is a wasteful number, since it uses less digits than its factorization.

21669327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407709 (or 2407706 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 21669327 is about 4655.0324381254. The cubic root of 21669327 is about 278.7929631406.

The spelling of 21669327 in words is "twenty-one million, six hundred sixty-nine thousand, three hundred twenty-seven".