21460161 has 4 divisors (see below), whose sum is σ = 28613552. Its totient is φ = 14306772.

The previous prime is 21460157. The next prime is 21460163. The reversal of 21460161 is 16106412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21460161 - 2² = 21460157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21460163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576691 + ... + 3576696.

It is an arithmetic number, because the mean of its divisors is an integer number (7153388).

Almost surely, 2^21460161 is an apocalyptic number.

It is an amenable number.

21460161 is a deficient number, since it is larger than the sum of its proper divisors (7153391).

21460161 is an equidigital number, since it uses as much as digits as its factorization.

21460161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7153390.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21460161 is about 4632.5113059765. The cubic root of 21460161 is about 277.8930328771.

Adding to 21460161 its reverse (16106412), we get a palindrome (37566573).

The spelling of 21460161 in words is "twenty-one million, four hundred sixty thousand, one hundred sixty-one".