21371241 has 4 divisors (see below), whose sum is σ = 28494992. Its totient is φ = 14247492.

The previous prime is 21371239. The next prime is 21371263. The reversal of 21371241 is 14217312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21371241 - 2¹ = 21371239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21371201) 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 3 ways as a sum of consecutive naturals, for example, 3561871 + ... + 3561876.

It is an arithmetic number, because the mean of its divisors is an integer number (7123748).

Almost surely, 2^21371241 is an apocalyptic number.

It is an amenable number.

21371241 is a deficient number, since it is larger than the sum of its proper divisors (7123751).

21371241 is an equidigital number, since it uses as much as digits as its factorization.

21371241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7123750.

The product of its digits is 336, while the sum is 21.

The square root of 21371241 is about 4622.9039574709. The cubic root of 21371241 is about 277.5086857114.

Adding to 21371241 its reverse (14217312), we get a palindrome (35588553).

It can be divided in two parts, 21371 and 241, that added together give a palindrome (21612).

The spelling of 21371241 in words is "twenty-one million, three hundred seventy-one thousand, two hundred forty-one".