21115054 has 8 divisors (see below), whose sum is σ = 33535728. Its totient is φ = 9936480.

The previous prime is 21115027. The next prime is 21115063. The reversal of 21115054 is 45051112.

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

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, 310482 + ... + 310549.

It is an arithmetic number, because the mean of its divisors is an integer number (4191966).

Almost surely, 2^21115054 is an apocalyptic number.

21115054 is a deficient number, since it is larger than the sum of its proper divisors (12420674).

21115054 is a wasteful number, since it uses less digits than its factorization.

21115054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621050.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 21115054 is about 4595.1119681679. Note that the first 3 decimals coincide. The cubic root of 21115054 is about 276.3953498938.

Adding to 21115054 its reverse (45051112), we get a palindrome (66166166).

The spelling of 21115054 in words is "twenty-one million, one hundred fifteen thousand, fifty-four".