18421071 has 8 divisors (see below), whose sum is σ = 25132800. Its totient is φ = 11995032.

The previous prime is 18421057. The next prime is 18421093. The reversal of 18421071 is 17012481.

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

It is not a de Polignac number, because 18421071 - 2⁹ = 18420559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420071) 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, 71271 + ... + 71528.

It is an arithmetic number, because the mean of its divisors is an integer number (3141600).

Almost surely, 2^18421071 is an apocalyptic number.

18421071 is a deficient number, since it is larger than the sum of its proper divisors (6711729).

18421071 is a wasteful number, since it uses less digits than its factorization.

18421071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142845.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 18421071 is about 4291.9775162505. The cubic root of 18421071 is about 264.1019607310.

The spelling of 18421071 in words is "eighteen million, four hundred twenty-one thousand, seventy-one".