21840141 has 8 divisors (see below), whose sum is σ = 29145760. Its totient is φ = 14547312.

The previous prime is 21840131. The next prime is 21840149. The reversal of 21840141 is 14104812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21840141 - 2⁵ = 21840109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21840149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1995 + ... + 6903.

It is an arithmetic number, because the mean of its divisors is an integer number (3643220).

Almost surely, 2^21840141 is an apocalyptic number.

It is an amenable number.

21840141 is a deficient number, since it is larger than the sum of its proper divisors (7305619).

21840141 is a wasteful number, since it uses less digits than its factorization.

21840141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6395.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 21840141 is about 4673.3436638022. The cubic root of 21840141 is about 279.5235989090.

Adding to 21840141 its reverse (14104812), we get a palindrome (35944953).

The spelling of 21840141 in words is "twenty-one million, eight hundred forty thousand, one hundred forty-one".