21484878 has 8 divisors (see below), whose sum is σ = 42969768. Its totient is φ = 7161624.

The previous prime is 21484843. The next prime is 21484913. The reversal of 21484878 is 87848412.

It is an interprime number because it is at equal distance from previous prime (21484843) and next prime (21484913).

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

21484878 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1790401 + ... + 1790412.

It is an arithmetic number, because the mean of its divisors is an integer number (5371221).

Almost surely, 2^21484878 is an apocalyptic number.

21484878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21484878 is a wasteful number, since it uses less digits than its factorization.

21484878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580818.

The product of its digits is 114688, while the sum is 42.

The square root of 21484878 is about 4635.1783137221. The cubic root of 21484878 is about 277.9996808305. Note that the first 3 decimals are identical.

The spelling of 21484878 in words is "twenty-one million, four hundred eighty-four thousand, eight hundred seventy-eight".