21680141 has 8 divisors (see below), whose sum is σ = 24930624. Its totient is φ = 18468000.

The previous prime is 21680101. The next prime is 21680143. The reversal of 21680141 is 14108612.

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

It is a cyclic number.

It is not a de Polignac number, because 21680141 - 2⁶ = 21680077 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 (21680143) 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, 8360 + ... + 10641.

It is an arithmetic number, because the mean of its divisors is an integer number (3116328).

Almost surely, 2^21680141 is an apocalyptic number.

It is an amenable number.

21680141 is a deficient number, since it is larger than the sum of its proper divisors (3250483).

21680141 is a wasteful number, since it uses less digits than its factorization.

21680141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19171.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 21680141 is about 4656.1938318760. The cubic root of 21680141 is about 278.8393323045.

Adding to 21680141 its reverse (14108612), we get a palindrome (35788753).

The spelling of 21680141 in words is "twenty-one million, six hundred eighty thousand, one hundred forty-one".