21689141 has 8 divisors (see below), whose sum is σ = 22334880. Its totient is φ = 21046608.

The previous prime is 21689131. The next prime is 21689149. The reversal of 21689141 is 14198612.

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 21689141 - 2⁶ = 21689077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21689098 and 21689107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21689149) 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, 22430 + ... + 23376.

It is an arithmetic number, because the mean of its divisors is an integer number (2791860).

Almost surely, 2^21689141 is an apocalyptic number.

It is an amenable number.

21689141 is a deficient number, since it is larger than the sum of its proper divisors (645739).

21689141 is an equidigital number, since it uses as much as digits as its factorization.

21689141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603.

The product of its digits is 3456, while the sum is 32.

The square root of 21689141 is about 4657.1601862079. The cubic root of 21689141 is about 278.8779114941.

The spelling of 21689141 in words is "twenty-one million, six hundred eighty-nine thousand, one hundred forty-one".