21641301 has 12 divisors (see below), whose sum is σ = 34101600. Its totient is φ = 13115880.

The previous prime is 21641281. The next prime is 21641303. The reversal of 21641301 is 10314612.

It is a happy number.

21641301 is a `hidden beast` number, since 21 + 641 + 3 + 0 + 1 = 666.

It is not a de Polignac number, because 21641301 - 2⁹ = 21640789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21641303) 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 11 ways as a sum of consecutive naturals, for example, 109201 + ... + 109398.

It is an arithmetic number, because the mean of its divisors is an integer number (2841800).

Almost surely, 2^21641301 is an apocalyptic number.

It is an amenable number.

21641301 is a deficient number, since it is larger than the sum of its proper divisors (12460299).

21641301 is a wasteful number, since it uses less digits than its factorization.

21641301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218616 (or 218613 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21641301 is about 4652.0211736405. The cubic root of 21641301 is about 278.6727190968.

Adding to 21641301 its reverse (10314612), we get a palindrome (31955913).

The spelling of 21641301 in words is "twenty-one million, six hundred forty-one thousand, three hundred one".