18853421 has 2 divisors, whose sum is σ = 18853422. Its totient is φ = 18853420.

The previous prime is 18853409. The next prime is 18853423. The reversal of 18853421 is 12435881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 1297321 = 4190^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 18853421 - 2¹⁰ = 18852397 is a prime.

Together with 18853423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18853423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9426710 + 9426711.

It is an arithmetic number, because the mean of its divisors is an integer number (9426711).

Almost surely, 2^18853421 is an apocalyptic number.

It is an amenable number.

18853421 is a deficient number, since it is larger than the sum of its proper divisors (1).

18853421 is an equidigital number, since it uses as much as digits as its factorization.

18853421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 32.

The square root of 18853421 is about 4342.0526251993. The cubic root of 18853421 is about 266.1521968064.

The spelling of 18853421 in words is "eighteen million, eight hundred fifty-three thousand, four hundred twenty-one".