21360550 has 24 divisors (see below), whose sum is σ = 41015232. Its totient is φ = 8268000.

The previous prime is 21360533. The next prime is 21360571. The reversal of 21360550 is 5506312.

It is a happy number.

21360550 is nontrivially palindromic in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5341 + ... + 8440.

It is an arithmetic number, because the mean of its divisors is an integer number (1708968).

Almost surely, 2^21360550 is an apocalyptic number.

21360550 is a deficient number, since it is larger than the sum of its proper divisors (19654682).

21360550 is a wasteful number, since it uses less digits than its factorization.

21360550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13824 (or 13819 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 21360550 is about 4621.7475050028. The cubic root of 21360550 is about 277.4624032608.

Adding to 21360550 its reverse (5506312), we get a palindrome (26866862).

The spelling of 21360550 in words is "twenty-one million, three hundred sixty thousand, five hundred fifty".