21461411 has 4 divisors (see below), whose sum is σ = 21495432. Its totient is φ = 21427392.

The previous prime is 21461399. The next prime is 21461413. The reversal of 21461411 is 11416412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21461411 is a prime.

It is a super-2 number, since 2×21461411² = 921184324221842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21461413) 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, 16046 + ... + 17331.

It is an arithmetic number, because the mean of its divisors is an integer number (5373858).

Almost surely, 2^21461411 is an apocalyptic number.

21461411 is a deficient number, since it is larger than the sum of its proper divisors (34021).

21461411 is an equidigital number, since it uses as much as digits as its factorization.

21461411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34020.

The product of its digits is 192, while the sum is 20.

The square root of 21461411 is about 4632.6462200345. The cubic root of 21461411 is about 277.8984282940.

Adding to 21461411 its reverse (11416412), we get a palindrome (32877823).

The spelling of 21461411 in words is "twenty-one million, four hundred sixty-one thousand, four hundred eleven".