16953421 has 2 divisors, whose sum is σ = 16953422. Its totient is φ = 16953420.

The previous prime is 16953397. The next prime is 16953427. The reversal of 16953421 is 12435961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8916196 + 8037225 = 2986^2 + 2835^2 .

It is a cyclic number.

It is not a de Polignac number, because 16953421 - 2⁵ = 16953389 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 (16953427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8476710 + 8476711.

It is an arithmetic number, because the mean of its divisors is an integer number (8476711).

Almost surely, 2^16953421 is an apocalyptic number.

It is an amenable number.

16953421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16953421 is an equidigital number, since it uses as much as digits as its factorization.

16953421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 16953421 is about 4117.4532177063. The cubic root of 16953421 is about 256.8931055805.

The spelling of 16953421 in words is "sixteen million, nine hundred fifty-three thousand, four hundred twenty-one".