21118146 has 32 divisors (see below), whose sum is σ = 48519168. Its totient is φ = 6002640.

The previous prime is 21118133. The next prime is 21118147. The reversal of 21118146 is 64181112.

It is not an unprimeable number, because it can be changed into a prime (21118147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7671 + ... + 10053.

It is an arithmetic number, because the mean of its divisors is an integer number (1516224).

Almost surely, 2^21118146 is an apocalyptic number.

21118146 is an abundant number, since it is smaller than the sum of its proper divisors (27401022).

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

21118146 is a wasteful number, since it uses less digits than its factorization.

21118146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606.

The product of its digits is 384, while the sum is 24.

The square root of 21118146 is about 4595.4484003196. The cubic root of 21118146 is about 276.4088406275.

Adding to 21118146 its reverse (64181112), we get a palindrome (85299258).

The spelling of 21118146 in words is "twenty-one million, one hundred eighteen thousand, one hundred forty-six".