19414721 has 2 divisors, whose sum is σ = 19414722. Its totient is φ = 19414720.

The previous prime is 19414709. The next prime is 19414723. The reversal of 19414721 is 12741491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 579121 = 4340^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 19414721 - 2¹⁸ = 19152577 is a prime.

Together with 19414723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19414723) 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, 9707360 + 9707361.

It is an arithmetic number, because the mean of its divisors is an integer number (9707361).

Almost surely, 2^19414721 is an apocalyptic number.

It is an amenable number.

19414721 is a deficient number, since it is larger than the sum of its proper divisors (1).

19414721 is an equidigital number, since it uses as much as digits as its factorization.

19414721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 19414721 is about 4406.2139076536. The cubic root of 19414721 is about 268.7676854415.

The spelling of 19414721 in words is "nineteen million, four hundred fourteen thousand, seven hundred twenty-one".