21133654 has 8 divisors (see below), whose sum is σ = 31775328. Its totient is φ = 10541880.

The previous prime is 21133649. The next prime is 21133667. The reversal of 21133654 is 45633112.

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, 11397 + ... + 13120.

It is an arithmetic number, because the mean of its divisors is an integer number (3971916).

Almost surely, 2^21133654 is an apocalyptic number.

21133654 is a deficient number, since it is larger than the sum of its proper divisors (10641674).

21133654 is a wasteful number, since it uses less digits than its factorization.

21133654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24950.

The product of its digits is 2160, while the sum is 25.

The square root of 21133654 is about 4597.1354124063. The cubic root of 21133654 is about 276.4764838676.

Adding to 21133654 its reverse (45633112), we get a palindrome (66766766).

The spelling of 21133654 in words is "twenty-one million, one hundred thirty-three thousand, six hundred fifty-four".