16829921 has 2 divisors, whose sum is σ = 16829922. Its totient is φ = 16829920.

The previous prime is 16829903. The next prime is 16829957. The reversal of 16829921 is 12992861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 829921 = 4000^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 16829921 - 2¹⁸ = 16567777 is a prime.

It is not a weakly prime, because it can be changed into another prime (16829221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8414960 + 8414961.

It is an arithmetic number, because the mean of its divisors is an integer number (8414961).

Almost surely, 2^16829921 is an apocalyptic number.

It is an amenable number.

16829921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16829921 is an equidigital number, since it uses as much as digits as its factorization.

16829921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 16829921 is about 4102.4286709217. The cubic root of 16829921 is about 256.2677912692.

It can be divided in two parts, 16 and 829921, that multiplied together give a square (13278736 = 3644²).

The spelling of 16829921 in words is "sixteen million, eight hundred twenty-nine thousand, nine hundred twenty-one".