21550485 has 32 divisors (see below), whose sum is σ = 37854720. Its totient is φ = 10382400.

The previous prime is 21550469. The next prime is 21550493. The reversal of 21550485 is 58405512.

It is not a de Polignac number, because 21550485 - 2⁴ = 21550469 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34506 + ... + 35124.

It is an arithmetic number, because the mean of its divisors is an integer number (1182960).

Almost surely, 2^21550485 is an apocalyptic number.

It is an amenable number.

21550485 is a deficient number, since it is larger than the sum of its proper divisors (16304235).

21550485 is a wasteful number, since it uses less digits than its factorization.

21550485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 21550485 is about 4642.2499932684. The cubic root of 21550485 is about 278.2823632468.

Adding to 21550485 its reverse (58405512), we get a palindrome (79955997).

The spelling of 21550485 in words is "twenty-one million, five hundred fifty thousand, four hundred eighty-five".