21673141 has 16 divisors (see below), whose sum is σ = 25488000. Its totient is φ = 18420864.

The previous prime is 21673139. The next prime is 21673159. The reversal of 21673141 is 14137612.

It is not a de Polignac number, because 21673141 - 2¹ = 21673139 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 (21673241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61221 + ... + 61573.

It is an arithmetic number, because the mean of its divisors is an integer number (1593000).

Almost surely, 2^21673141 is an apocalyptic number.

It is an amenable number.

21673141 is a deficient number, since it is larger than the sum of its proper divisors (3814859).

21673141 is an equidigital number, since it uses as much as digits as its factorization.

21673141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 539 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 21673141 is about 4655.4420842708. The cubic root of 21673141 is about 278.8093188860.

The spelling of 21673141 in words is "twenty-one million, six hundred seventy-three thousand, one hundred forty-one".