21040141 has 4 divisors (see below), whose sum is σ = 21181500. Its totient is φ = 20898784.

The previous prime is 21040139. The next prime is 21040157. The reversal of 21040141 is 14104012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3316041 + 17724100 = 1821^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 21040141 - 2¹ = 21040139 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 (21040111) 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, 70456 + ... + 70753.

It is an arithmetic number, because the mean of its divisors is an integer number (5295375).

Almost surely, 2^21040141 is an apocalyptic number.

It is an amenable number.

21040141 is a deficient number, since it is larger than the sum of its proper divisors (141359).

21040141 is a wasteful number, since it uses less digits than its factorization.

21040141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141358.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21040141 is about 4586.9533461765. The cubic root of 21040141 is about 276.0680930150.

Adding to 21040141 its reverse (14104012), we get a palindrome (35144153).

The spelling of 21040141 in words is "twenty-one million, forty thousand, one hundred forty-one".