16059821 has 2 divisors, whose sum is σ = 16059822. Its totient is φ = 16059820.

The previous prime is 16059817. The next prime is 16059847. The reversal of 16059821 is 12895061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13402921 + 2656900 = 3661^2 + 1630^2 .

It is a cyclic number.

It is not a de Polignac number, because 16059821 - 2² = 16059817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16059811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8029910 + 8029911.

It is an arithmetic number, because the mean of its divisors is an integer number (8029911).

Almost surely, 2^16059821 is an apocalyptic number.

It is an amenable number.

16059821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16059821 is an equidigital number, since it uses as much as digits as its factorization.

16059821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 16059821 is about 4007.4706486760. The cubic root of 16059821 is about 252.2978599816.

The spelling of 16059821 in words is "sixteen million, fifty-nine thousand, eight hundred twenty-one".