21478485 has 16 divisors (see below), whose sum is σ = 39275136. Its totient is φ = 9818688.

The previous prime is 21478453. The next prime is 21478489. The reversal of 21478485 is 58487412.

It is a happy number.

It is not a de Polignac number, because 21478485 - 2⁵ = 21478453 is a prime.

It is a super-2 number, since 2×21478485² = 922650635790450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21478489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102174 + ... + 102383.

It is an arithmetic number, because the mean of its divisors is an integer number (2454696).

Almost surely, 2^21478485 is an apocalyptic number.

It is an amenable number.

21478485 is a deficient number, since it is larger than the sum of its proper divisors (17796651).

21478485 is a wasteful number, since it uses less digits than its factorization.

21478485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204572.

The product of its digits is 71680, while the sum is 39.

The square root of 21478485 is about 4634.4886449316. The cubic root of 21478485 is about 277.9721044073.

The spelling of 21478485 in words is "twenty-one million, four hundred seventy-eight thousand, four hundred eighty-five".