21475463 has 4 divisors (see below), whose sum is σ = 21519000. Its totient is φ = 21431928.

The previous prime is 21475459. The next prime is 21475499. The reversal of 21475463 is 36457412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21475463 - 2² = 21475459 is a prime.

It is a super-2 number, since 2×21475463² = 922391022128738, 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 (21472463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21020 + ... + 22017.

It is an arithmetic number, because the mean of its divisors is an integer number (5379750).

Almost surely, 2^21475463 is an apocalyptic number.

21475463 is a deficient number, since it is larger than the sum of its proper divisors (43537).

21475463 is an equidigital number, since it uses as much as digits as its factorization.

21475463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43536.

The product of its digits is 20160, while the sum is 32.

The square root of 21475463 is about 4634.1625996506. The cubic root of 21475463 is about 277.9590670026.

The spelling of 21475463 in words is "twenty-one million, four hundred seventy-five thousand, four hundred sixty-three".