21800162 has 4 divisors (see below), whose sum is σ = 32700246. Its totient is φ = 10900080.

The previous prime is 21800131. The next prime is 21800189. The reversal of 21800162 is 26100812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21520321 + 279841 = 4639^2 + 529^2 .

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 as a sum of consecutive naturals, namely, 5450039 + ... + 5450042.

Almost surely, 2^21800162 is an apocalyptic number.

21800162 is a deficient number, since it is larger than the sum of its proper divisors (10900084).

21800162 is a wasteful number, since it uses less digits than its factorization.

21800162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10900083.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21800162 is about 4669.0643602332. The cubic root of 21800162 is about 279.3529360965.

Adding to 21800162 its reverse (26100812), we get a palindrome (47900974).

The spelling of 21800162 in words is "twenty-one million, eight hundred thousand, one hundred sixty-two".