21120054 has 8 divisors (see below), whose sum is σ = 42240120. Its totient is φ = 7040016.

The previous prime is 21120041. The next prime is 21120067. The reversal of 21120054 is 45002112.

It is an interprime number because it is at equal distance from previous prime (21120041) and next prime (21120067).

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

21120054 is an admirable number.

It is a Curzon 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, 1759999 + ... + 1760010.

It is an arithmetic number, because the mean of its divisors is an integer number (5280015).

Almost surely, 2^21120054 is an apocalyptic number.

21120054 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.

21120054 is a wasteful number, since it uses less digits than its factorization.

21120054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520014.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21120054 is about 4595.6559923476. The cubic root of 21120054 is about 276.4171647829.

Adding to 21120054 its reverse (45002112), we get a palindrome (66122166).

The spelling of 21120054 in words is "twenty-one million, one hundred twenty thousand, fifty-four".