21475963 has 8 divisors (see below), whose sum is σ = 22685696. Its totient is φ = 20298600.

The previous prime is 21475957. The next prime is 21475973. The reversal of 21475963 is 36957412.

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 21475963 - 2⁹ = 21475451 is a prime.

It is a super-2 number, since 2×21475963² = 922433973554738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21475973) 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, 6723 + ... + 9388.

It is an arithmetic number, because the mean of its divisors is an integer number (2835712).

Almost surely, 2^21475963 is an apocalyptic number.

21475963 is a deficient number, since it is larger than the sum of its proper divisors (1209733).

21475963 is a wasteful number, since it uses less digits than its factorization.

21475963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16185.

The product of its digits is 45360, while the sum is 37.

The square root of 21475963 is about 4634.2165465157. The cubic root of 21475963 is about 277.9612241692.

The spelling of 21475963 in words is "twenty-one million, four hundred seventy-five thousand, nine hundred sixty-three".