21802146 has 16 divisors (see below), whose sum is σ = 43653600. Its totient is φ = 7259168.

The previous prime is 21802141. The next prime is 21802159. The reversal of 21802146 is 64120812.

It is not an unprimeable number, because it can be changed into a prime (21802141) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 6325 + ... + 9143.

It is an arithmetic number, because the mean of its divisors is an integer number (2728350).

Almost surely, 2^21802146 is an apocalyptic number.

21802146 is an abundant number, since it is smaller than the sum of its proper divisors (21851454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21802146 is a wasteful number, since it uses less digits than its factorization.

21802146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4113.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21802146 is about 4669.2768176667. The cubic root of 21802146 is about 279.3614103365.

Adding to 21802146 its reverse (64120812), we get a palindrome (85922958).

The spelling of 21802146 in words is "twenty-one million, eight hundred two thousand, one hundred forty-six".