21332654 has 16 divisors (see below), whose sum is σ = 38721888. Its totient is φ = 8604672.

The previous prime is 21332653. The next prime is 21332693. The reversal of 21332654 is 45623312.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44579 + ... + 45054.

It is an arithmetic number, because the mean of its divisors is an integer number (2420118).

Almost surely, 2^21332654 is an apocalyptic number.

21332654 is a deficient number, since it is larger than the sum of its proper divisors (17389234).

21332654 is a wasteful number, since it uses less digits than its factorization.

21332654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89659.

The product of its digits is 4320, while the sum is 26.

The square root of 21332654 is about 4618.7286129410. The cubic root of 21332654 is about 277.3415658126.

Adding to 21332654 its reverse (45623312), we get a palindrome (66955966).

The spelling of 21332654 in words is "twenty-one million, three hundred thirty-two thousand, six hundred fifty-four".