21354206 has 8 divisors (see below), whose sum is σ = 32097000. Its totient is φ = 10655208.

The previous prime is 21354197. The next prime is 21354241. The reversal of 21354206 is 60245312.

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

It is a super-2 number, since 2×21354206² = 912004227780872, which contains 22 as substring.

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, 9701 + ... + 11696.

It is an arithmetic number, because the mean of its divisors is an integer number (4012125).

Almost surely, 2^21354206 is an apocalyptic number.

21354206 is a deficient number, since it is larger than the sum of its proper divisors (10742794).

21354206 is a wasteful number, since it uses less digits than its factorization.

21354206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21898.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21354206 is about 4621.0611335493. The cubic root of 21354206 is about 277.4349321240.

Adding to 21354206 its reverse (60245312), we get a palindrome (81599518).

The spelling of 21354206 in words is "twenty-one million, three hundred fifty-four thousand, two hundred six".