21320054 has 16 divisors (see below), whose sum is σ = 36643488. Its totient is φ = 9113472.

The previous prime is 21320053. The next prime is 21320059. The reversal of 21320054 is 45002312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4304 + ... + 7820.

It is an arithmetic number, because the mean of its divisors is an integer number (2290218).

Almost surely, 2^21320054 is an apocalyptic number.

21320054 is a deficient number, since it is larger than the sum of its proper divisors (15323434).

21320054 is a wasteful number, since it uses less digits than its factorization.

21320054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21320054 is about 4617.3643997415. The cubic root of 21320054 is about 277.2869516991.

Adding to 21320054 its reverse (45002312), we get a palindrome (66322366).

The spelling of 21320054 in words is "twenty-one million, three hundred twenty thousand, fifty-four".