21461017 has 4 divisors (see below), whose sum is σ = 21470500. Its totient is φ = 21451536.

The previous prime is 21460993. The next prime is 21461023. The reversal of 21461017 is 71016412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4618201 + 16842816 = 2149^2 + 4104^2 .

It is a cyclic number.

It is not a de Polignac number, because 21461017 - 2⁷ = 21460889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21461087) 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, 859 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (5367625).

Almost surely, 2^21461017 is an apocalyptic number.

It is an amenable number.

21461017 is a deficient number, since it is larger than the sum of its proper divisors (9483).

21461017 is an equidigital number, since it uses as much as digits as its factorization.

21461017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9482.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21461017 is about 4632.6036955475. The cubic root of 21461017 is about 277.8967276812.

Adding to 21461017 its reverse (71016412), we get a palindrome (92477429).

The spelling of 21461017 in words is "twenty-one million, four hundred sixty-one thousand, seventeen".