21484187 has 2 divisors, whose sum is σ = 21484188. Its totient is φ = 21484186.

The previous prime is 21484163. The next prime is 21484213. The reversal of 21484187 is 78148412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21484187 - 2¹⁸ = 21222043 is a prime.

It is a super-3 number, since 3×21484187³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21484487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742093 + 10742094.

It is an arithmetic number, because the mean of its divisors is an integer number (10742094).

Almost surely, 2^21484187 is an apocalyptic number.

21484187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21484187 is an equidigital number, since it uses as much as digits as its factorization.

21484187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14336, while the sum is 35.

The square root of 21484187 is about 4635.1037744586. The cubic root of 21484187 is about 277.9967004422.

The spelling of 21484187 in words is "twenty-one million, four hundred eighty-four thousand, one hundred eighty-seven".