21271461 has 8 divisors (see below), whose sum is σ = 28721280. Its totient is φ = 14001312.

The previous prime is 21271451. The next prime is 21271483. The reversal of 21271461 is 16417212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21271461 - 2⁵ = 21271429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44640 + ... + 45113.

It is an arithmetic number, because the mean of its divisors is an integer number (3590160).

Almost surely, 2^21271461 is an apocalyptic number.

It is an amenable number.

21271461 is a deficient number, since it is larger than the sum of its proper divisors (7449819).

21271461 is an equidigital number, since it uses as much as digits as its factorization.

21271461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89835.

The product of its digits is 672, while the sum is 24.

The square root of 21271461 is about 4612.0994134992. The cubic root of 21271461 is about 277.0761258620.

Adding to 21271461 its reverse (16417212), we get a palindrome (37688673).

The spelling of 21271461 in words is "twenty-one million, two hundred seventy-one thousand, four hundred sixty-one".