21009162 has 16 divisors (see below), whose sum is σ = 42491520. Its totient is φ = 6924192.

The previous prime is 21009151. The next prime is 21009167. The reversal of 21009162 is 26190012.

It is not an unprimeable number, because it can be changed into a prime (21009167) 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, 19138 + ... + 20205.

It is an arithmetic number, because the mean of its divisors is an integer number (2655720).

Almost surely, 2^21009162 is an apocalyptic number.

21009162 is an abundant number, since it is smaller than the sum of its proper divisors (21482358).

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

21009162 is a wasteful number, since it uses less digits than its factorization.

21009162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39437.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21009162 is about 4583.5752421009. The cubic root of 21009162 is about 275.9325344447.

Adding to 21009162 its reverse (26190012), we get a palindrome (47199174).

The spelling of 21009162 in words is "twenty-one million, nine thousand, one hundred sixty-two".