21227654 has 8 divisors (see below), whose sum is σ = 36390288. Its totient is φ = 9097560.

The previous prime is 21227629. The next prime is 21227671. The reversal of 21227654 is 45672212.

It is a happy number.

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

It is a super-2 number, since 2×21227654² = 901226588687432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 758117 + ... + 758144.

It is an arithmetic number, because the mean of its divisors is an integer number (4548786).

Almost surely, 2^21227654 is an apocalyptic number.

21227654 is a deficient number, since it is larger than the sum of its proper divisors (15162634).

21227654 is a wasteful number, since it uses less digits than its factorization.

21227654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516270.

The product of its digits is 6720, while the sum is 29.

The square root of 21227654 is about 4607.3478271127. The cubic root of 21227654 is about 276.8857892142.

Adding to 21227654 its reverse (45672212), we get a palindrome (66899866).

The spelling of 21227654 in words is "twenty-one million, two hundred twenty-seven thousand, six hundred fifty-four".