16275821 has 2 divisors, whose sum is σ = 16275822. Its totient is φ = 16275820.

The previous prime is 16275797. The next prime is 16275859. The reversal of 16275821 is 12857261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14546596 + 1729225 = 3814^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 16275821 - 2¹⁴ = 16259437 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 (16275521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8137910 + 8137911.

It is an arithmetic number, because the mean of its divisors is an integer number (8137911).

Almost surely, 2^16275821 is an apocalyptic number.

It is an amenable number.

16275821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16275821 is an equidigital number, since it uses as much as digits as its factorization.

16275821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 16275821 is about 4034.3303037803. The cubic root of 16275821 is about 253.4239378516.

The spelling of 16275821 in words is "sixteen million, two hundred seventy-five thousand, eight hundred twenty-one".