21125162 has 4 divisors (see below), whose sum is σ = 31687746. Its totient is φ = 10562580.

The previous prime is 21125161. The next prime is 21125177. The reversal of 21125162 is 26152112.

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., 10621081 + 10504081 = 3259^2 + 3241^2 .

It is not an unprimeable number, because it can be changed into a prime (21125161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5281289 + ... + 5281292.

Almost surely, 2^21125162 is an apocalyptic number.

21125162 is a deficient number, since it is larger than the sum of its proper divisors (10562584).

21125162 is a wasteful number, since it uses less digits than its factorization.

21125162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10562583.

The product of its digits is 240, while the sum is 20.

The square root of 21125162 is about 4596.2117009555. The cubic root of 21125162 is about 276.4394473184.

Adding to 21125162 its reverse (26152112), we get a palindrome (47277274).

The spelling of 21125162 in words is "twenty-one million, one hundred twenty-five thousand, one hundred sixty-two".