21441187 has 8 divisors (see below), whose sum is σ = 21678272. Its totient is φ = 21205800.

The previous prime is 21441169. The next prime is 21441191. The reversal of 21441187 is 78114412.

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 21441187 - 2¹¹ = 21439139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441137) 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, 64612 + ... + 64942.

It is an arithmetic number, because the mean of its divisors is an integer number (2709784).

Almost surely, 2^21441187 is an apocalyptic number.

21441187 is a deficient number, since it is larger than the sum of its proper divisors (237085).

21441187 is a wasteful number, since it uses less digits than its factorization.

21441187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849.

The product of its digits is 1792, while the sum is 28.

The square root of 21441187 is about 4630.4629358197. The cubic root of 21441187 is about 277.8111090255.

Adding to 21441187 its reverse (78114412), we get a palindrome (99555599).

The spelling of 21441187 in words is "twenty-one million, four hundred forty-one thousand, one hundred eighty-seven".