21461841 has 10 divisors (see below), whose sum is σ = 32060402. Its totient is φ = 14307840.

The previous prime is 21461833. The next prime is 21461893. The reversal of 21461841 is 14816412.

It is a happy number.

21461841 is a `hidden beast` number, since 2 + 1 + 4 + 618 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 4322241 = 4140^2 + 2079^2 .

It is not a de Polignac number, because 21461841 - 2³ = 21461833 is a prime.

It is a super-2 number, since 2×21461841² = 921221238218562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21461821) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 132400 + ... + 132561.

Almost surely, 2^21461841 is an apocalyptic number.

It is an amenable number.

21461841 is a deficient number, since it is larger than the sum of its proper divisors (10598561).

21461841 is an equidigital number, since it uses as much as digits as its factorization.

21461841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264973 (or 264964 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 21461841 is about 4632.6926295622. The cubic root of 21461841 is about 277.9002842690.

The spelling of 21461841 in words is "twenty-one million, four hundred sixty-one thousand, eight hundred forty-one".