21477485 has 8 divisors (see below), whose sum is σ = 25944576. Its totient is φ = 17067600.

The previous prime is 21477461. The next prime is 21477497. The reversal of 21477485 is 58477412.

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

It is not a de Polignac number, because 21477485 - 2²⁰ = 20428909 is a prime.

It is a super-2 number, since 2×21477485² = 922564723850450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13469 + ... + 14978.

It is an arithmetic number, because the mean of its divisors is an integer number (3243072).

Almost surely, 2^21477485 is an apocalyptic number.

It is an amenable number.

21477485 is a deficient number, since it is larger than the sum of its proper divisors (4467091).

21477485 is a wasteful number, since it uses less digits than its factorization.

21477485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28603.

The product of its digits is 62720, while the sum is 38.

The square root of 21477485 is about 4634.3807569081. The cubic root of 21477485 is about 277.9677903783.

The spelling of 21477485 in words is "twenty-one million, four hundred seventy-seven thousand, four hundred eighty-five".