21066141 has 8 divisors (see below), whose sum is σ = 28215040. Its totient is φ = 13980672.

The previous prime is 21066113. The next prime is 21066181. The reversal of 21066141 is 14166012.

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

It is not a de Polignac number, because 21066141 - 2⁵ = 21066109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21066181) 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, 15076 + ... + 16413.

It is an arithmetic number, because the mean of its divisors is an integer number (3526880).

Almost surely, 2^21066141 is an apocalyptic number.

It is an amenable number.

21066141 is a deficient number, since it is larger than the sum of its proper divisors (7148899).

21066141 is a wasteful number, since it uses less digits than its factorization.

21066141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31715.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21066141 is about 4589.7865963463. The cubic root of 21066141 is about 276.1817617058.

The spelling of 21066141 in words is "twenty-one million, sixty-six thousand, one hundred forty-one".