21288054 has 8 divisors (see below), whose sum is σ = 42576120. Its totient is φ = 7096016.

The previous prime is 21288049. The next prime is 21288067. The reversal of 21288054 is 45088212.

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

21288054 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, 1773999 + ... + 1774010.

It is an arithmetic number, because the mean of its divisors is an integer number (5322015).

Almost surely, 2^21288054 is an apocalyptic number.

21288054 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.

21288054 is a wasteful number, since it uses less digits than its factorization.

21288054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548014.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 21288054 is about 4613.8979182466. The cubic root of 21288054 is about 277.1481524023.

The spelling of 21288054 in words is "twenty-one million, two hundred eighty-eight thousand, fifty-four".