21144118 has 8 divisors (see below), whose sum is σ = 31761648. Its totient is φ = 10556904.

The previous prime is 21144083. The next prime is 21144119. The reversal of 21144118 is 81144112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144119) 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, 5746 + ... + 8677.

It is an arithmetic number, because the mean of its divisors is an integer number (3970206).

Almost surely, 2^21144118 is an apocalyptic number.

21144118 is a deficient number, since it is larger than the sum of its proper divisors (10617530).

21144118 is a wasteful number, since it uses less digits than its factorization.

21144118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15158.

The product of its digits is 256, while the sum is 22.

The square root of 21144118 is about 4598.2733716037. The cubic root of 21144118 is about 276.5221073484.

The spelling of 21144118 in words is "twenty-one million, one hundred forty-four thousand, one hundred eighteen".