18014921 has 2 divisors, whose sum is σ = 18014922. Its totient is φ = 18014920.

The previous prime is 18014897. The next prime is 18014933. The reversal of 18014921 is 12941081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17131321 + 883600 = 4139^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 18014921 - 2¹⁴ = 17998537 is a prime.

It is not a weakly prime, because it can be changed into another prime (18014021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9007460 + 9007461.

It is an arithmetic number, because the mean of its divisors is an integer number (9007461).

Almost surely, 2^18014921 is an apocalyptic number.

It is an amenable number.

18014921 is a deficient number, since it is larger than the sum of its proper divisors (1).

18014921 is an equidigital number, since it uses as much as digits as its factorization.

18014921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18014921 is about 4244.3987795682. The cubic root of 18014921 is about 262.1465343881.

The spelling of 18014921 in words is "eighteen million, fourteen thousand, nine hundred twenty-one".