16711421 has 2 divisors, whose sum is σ = 16711422. Its totient is φ = 16711420.

The previous prime is 16711399. The next prime is 16711427. The reversal of 16711421 is 12411761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10310521 + 6400900 = 3211^2 + 2530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16711421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16711427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8355710 + 8355711.

It is an arithmetic number, because the mean of its divisors is an integer number (8355711).

Almost surely, 2^16711421 is an apocalyptic number.

It is an amenable number.

16711421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16711421 is an equidigital number, since it uses as much as digits as its factorization.

16711421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 23.

The square root of 16711421 is about 4087.9604939383. The cubic root of 16711421 is about 255.6649109038.

The spelling of 16711421 in words is "sixteen million, seven hundred eleven thousand, four hundred twenty-one".