21366141 has 16 divisors (see below), whose sum is σ = 29494080. Its totient is φ = 13749120.

The previous prime is 21366139. The next prime is 21366173. The reversal of 21366141 is 14166312.

It is not a de Polignac number, because 21366141 - 2¹ = 21366139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10551 + ... + 12411.

It is an arithmetic number, because the mean of its divisors is an integer number (1843380).

Almost surely, 2^21366141 is an apocalyptic number.

It is an amenable number.

21366141 is a deficient number, since it is larger than the sum of its proper divisors (8127939).

21366141 is a wasteful number, since it uses less digits than its factorization.

21366141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996.

The product of its digits is 864, while the sum is 24.

The square root of 21366141 is about 4622.3523232225. The cubic root of 21366141 is about 277.4866092069.

The spelling of 21366141 in words is "twenty-one million, three hundred sixty-six thousand, one hundred forty-one".