21461461 has 24 divisors (see below), whose sum is σ = 26429760. Its totient is φ = 17341632.

The previous prime is 21461441. The next prime is 21461467. The reversal of 21461461 is 16416412.

It is not a de Polignac number, because 21461461 - 2⁹ = 21460949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461467) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154330 + ... + 154468.

It is an arithmetic number, because the mean of its divisors is an integer number (1101240).

Almost surely, 2^21461461 is an apocalyptic number.

It is an amenable number.

21461461 is a deficient number, since it is larger than the sum of its proper divisors (4968299).

21461461 is a wasteful number, since it uses less digits than its factorization.

21461461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 306 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 21461461 is about 4632.6516165151. The cubic root of 21461461 is about 277.8986441063.

Adding to 21461461 its reverse (16416412), we get a palindrome (37877873).

The spelling of 21461461 in words is "twenty-one million, four hundred sixty-one thousand, four hundred sixty-one".