21725162 has 16 divisors (see below), whose sum is σ = 33530112. Its totient is φ = 10550880.

The previous prime is 21725161. The next prime is 21725183. The reversal of 21725162 is 26152712.

It is not an unprimeable number, because it can be changed into a prime (21725161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24743 + ... + 25605.

It is an arithmetic number, because the mean of its divisors is an integer number (2095632).

Almost surely, 2^21725162 is an apocalyptic number.

21725162 is a deficient number, since it is larger than the sum of its proper divisors (11804950).

21725162 is a wasteful number, since it uses less digits than its factorization.

21725162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213.

The product of its digits is 1680, while the sum is 26.

The square root of 21725162 is about 4661.0258527496. The cubic root of 21725162 is about 279.0322115231.

Adding to 21725162 its reverse (26152712), we get a palindrome (47877874).

The spelling of 21725162 in words is "twenty-one million, seven hundred twenty-five thousand, one hundred sixty-two".