21705162 has 16 divisors (see below), whose sum is σ = 44584032. Its totient is φ = 7039440.

The previous prime is 21705161. The next prime is 21705191. The reversal of 21705162 is 26150712.

It is a super-2 number, since 2×21705162² = 942228114892488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21705161) 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, 48664 + ... + 49107.

It is an arithmetic number, because the mean of its divisors is an integer number (2786502).

Almost surely, 2^21705162 is an apocalyptic number.

21705162 is an abundant number, since it is smaller than the sum of its proper divisors (22878870).

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

21705162 is a wasteful number, since it uses less digits than its factorization.

21705162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97813.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 21705162 is about 4658.8799083041. The cubic root of 21705162 is about 278.9465603382.

Adding to 21705162 its reverse (26150712), we get a palindrome (47855874).

The spelling of 21705162 in words is "twenty-one million, seven hundred five thousand, one hundred sixty-two".