18421153 has 4 divisors (see below), whose sum is σ = 18919060. Its totient is φ = 17923248.

The previous prime is 18421129. The next prime is 18421201. The reversal of 18421153 is 35112481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35112481 = 1621 ⋅21661.

It can be written as a sum of positive squares in 2 ways, for example, as 9941409 + 8479744 = 3153^2 + 2912^2 .

It is a cyclic number.

It is not a de Polignac number, because 18421153 - 2⁵ = 18421121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18421553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248898 + ... + 248971.

It is an arithmetic number, because the mean of its divisors is an integer number (4729765).

Almost surely, 2^18421153 is an apocalyptic number.

It is an amenable number.

18421153 is a deficient number, since it is larger than the sum of its proper divisors (497907).

18421153 is an equidigital number, since it uses as much as digits as its factorization.

18421153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497906.

The product of its digits is 960, while the sum is 25.

The square root of 18421153 is about 4291.9870689460. The cubic root of 18421153 is about 264.1023526070.

The spelling of 18421153 in words is "eighteen million, four hundred twenty-one thousand, one hundred fifty-three".