21221054 has 8 divisors (see below), whose sum is σ = 32692008. Its totient is φ = 10323720.

The previous prime is 21221051. The next prime is 21221063. The reversal of 21221054 is 45012212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221051) 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, 143312 + ... + 143459.

It is an arithmetic number, because the mean of its divisors is an integer number (4086501).

Almost surely, 2^21221054 is an apocalyptic number.

21221054 is a deficient number, since it is larger than the sum of its proper divisors (11470954).

21221054 is a wasteful number, since it uses less digits than its factorization.

21221054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286810.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21221054 is about 4606.6315242268. The cubic root of 21221054 is about 276.8570902407.

Adding to 21221054 its reverse (45012212), we get a palindrome (66233266).

The spelling of 21221054 in words is "twenty-one million, two hundred twenty-one thousand, fifty-four".