19684121 has 2 divisors, whose sum is σ = 19684122. Its totient is φ = 19684120.

The previous prime is 19684097. The next prime is 19684129. The reversal of 19684121 is 12148691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16483600 + 3200521 = 4060^2 + 1789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19684121 is a prime.

It is not a weakly prime, because it can be changed into another prime (19684129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9842060 + 9842061.

It is an arithmetic number, because the mean of its divisors is an integer number (9842061).

Almost surely, 2^19684121 is an apocalyptic number.

It is an amenable number.

19684121 is a deficient number, since it is larger than the sum of its proper divisors (1).

19684121 is an equidigital number, since it uses as much as digits as its factorization.

19684121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 19684121 is about 4436.6790508217. The cubic root of 19684121 is about 270.0051256457.

The spelling of 19684121 in words is "nineteen million, six hundred eighty-four thousand, one hundred twenty-one".