21477317 has 8 divisors (see below), whose sum is σ = 22099392. Its totient is φ = 20860000.

The previous prime is 21477301. The next prime is 21477343. The reversal of 21477317 is 71377412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21477317 - 2⁴ = 21477301 is a prime.

It is a super-2 number, since 2×21477317² = 922550291036978, 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 (21477517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9248 + ... + 11334.

It is an arithmetic number, because the mean of its divisors is an integer number (2762424).

Almost surely, 2^21477317 is an apocalyptic number.

It is an amenable number.

21477317 is a deficient number, since it is larger than the sum of its proper divisors (622075).

21477317 is a wasteful number, since it uses less digits than its factorization.

21477317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379.

The product of its digits is 8232, while the sum is 32.

The square root of 21477317 is about 4634.3626314737. The cubic root of 21477317 is about 277.9670656083.

The spelling of 21477317 in words is "twenty-one million, four hundred seventy-seven thousand, three hundred seventeen".