21054234 has 8 divisors (see below), whose sum is σ = 42108480. Its totient is φ = 7018076.

The previous prime is 21054233. The next prime is 21054247. The reversal of 21054234 is 43245012.

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

21054234 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21054234.

It is not an unprimeable number, because it can be changed into a prime (21054233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1754514 + ... + 1754525.

It is an arithmetic number, because the mean of its divisors is an integer number (5263560).

Almost surely, 2^21054234 is an apocalyptic number.

21054234 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.

21054234 is a wasteful number, since it uses less digits than its factorization.

21054234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509044.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21054234 is about 4588.4892938744. The cubic root of 21054234 is about 276.1297174324.

Adding to 21054234 its reverse (43245012), we get a palindrome (64299246).

The spelling of 21054234 in words is "twenty-one million, fifty-four thousand, two hundred thirty-four".