21204141 has 16 divisors (see below), whose sum is σ = 32377344. Its totient is φ = 12091824.

The previous prime is 21204121. The next prime is 21204143. The reversal of 21204141 is 14140212.

It is not a de Polignac number, because 21204141 - 2⁶ = 21204077 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21204141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15886 + ... + 17168.

It is an arithmetic number, because the mean of its divisors is an integer number (2023584).

Almost surely, 2^21204141 is an apocalyptic number.

21204141 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21204141 is a deficient number, since it is larger than the sum of its proper divisors (11173203).

21204141 is a wasteful number, since it uses less digits than its factorization.

21204141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21204141 is about 4604.7954351958. The cubic root of 21204141 is about 276.7835197749.

Adding to 21204141 its reverse (14140212), we get a palindrome (35344353).

The spelling of 21204141 in words is "twenty-one million, two hundred four thousand, one hundred forty-one".