21361141 has 4 divisors (see below), whose sum is σ = 21680032. Its totient is φ = 21042252.

The previous prime is 21361133. The next prime is 21361147. The reversal of 21361141 is 14116312.

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 a cyclic number.

It is not a de Polignac number, because 21361141 - 2³ = 21361133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159345 + ... + 159478.

It is an arithmetic number, because the mean of its divisors is an integer number (5420008).

Almost surely, 2^21361141 is an apocalyptic number.

It is an amenable number.

21361141 is a deficient number, since it is larger than the sum of its proper divisors (318891).

21361141 is an equidigital number, since it uses as much as digits as its factorization.

21361141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318890.

The product of its digits is 144, while the sum is 19.

The square root of 21361141 is about 4621.8114414156. The cubic root of 21361141 is about 277.4649621644.

Adding to 21361141 its reverse (14116312), we get a palindrome (35477453).

The spelling of 21361141 in words is "twenty-one million, three hundred sixty-one thousand, one hundred forty-one".