21054130 has 8 divisors (see below), whose sum is σ = 37897452. Its totient is φ = 8421648.

The previous prime is 21054119. The next prime is 21054169. The reversal of 21054130 is 3145012.

It can be written as a sum of positive squares in 2 ways, for example, as 17363889 + 3690241 = 4167^2 + 1921^2 .

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

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, 1052697 + ... + 1052716.

Almost surely, 2^21054130 is an apocalyptic number.

21054130 is a deficient number, since it is larger than the sum of its proper divisors (16843322).

21054130 is a wasteful number, since it uses less digits than its factorization.

21054130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105420.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21054130 is about 4588.4779611544. The cubic root of 21054130 is about 276.1292627726.

Adding to 21054130 its reverse (3145012), we get a palindrome (24199142).

The spelling of 21054130 in words is "twenty-one million, fifty-four thousand, one hundred thirty".