16375421 has 2 divisors, whose sum is σ = 16375422. Its totient is φ = 16375420.

The previous prime is 16375367. The next prime is 16375439. The reversal of 16375421 is 12457361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10562500 + 5812921 = 3250^2 + 2411^2 .

It is a cyclic number.

It is not a de Polignac number, because 16375421 - 2¹⁴ = 16359037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16375481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8187710 + 8187711.

It is an arithmetic number, because the mean of its divisors is an integer number (8187711).

Almost surely, 2^16375421 is an apocalyptic number.

It is an amenable number.

16375421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16375421 is an equidigital number, since it uses as much as digits as its factorization.

16375421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 16375421 is about 4046.6555326590. The cubic root of 16375421 is about 253.9398301272.

The spelling of 16375421 in words is "sixteen million, three hundred seventy-five thousand, four hundred twenty-one".