21054310 has 8 divisors (see below), whose sum is σ = 37897776. Its totient is φ = 8421720.

The previous prime is 21054289. The next prime is 21054311. The reversal of 21054310 is 1345012.

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

It is a super-3 number, since 3×21054310³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054311) 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, 1052706 + ... + 1052725.

It is an arithmetic number, because the mean of its divisors is an integer number (4737222).

Almost surely, 2^21054310 is an apocalyptic number.

21054310 is a deficient number, since it is larger than the sum of its proper divisors (16843466).

21054310 is a wasteful number, since it uses less digits than its factorization.

21054310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105438.

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

The square root of 21054310 is about 4588.4975754597. The cubic root of 21054310 is about 276.1300496828.

Adding to 21054310 its reverse (1345012), we get a palindrome (22399322).

The spelling of 21054310 in words is "twenty-one million, fifty-four thousand, three hundred ten".