16421129 has 2 divisors, whose sum is σ = 16421130. Its totient is φ = 16421128.

The previous prime is 16421113. The next prime is 16421147. The reversal of 16421129 is 92112461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 1054729 = 3920^2 + 1027^2 .

It is a cyclic number.

It is not a de Polignac number, because 16421129 - 2⁴ = 16421113 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16421098 and 16421107.

It is not a weakly prime, because it can be changed into another prime (16421159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210564 + 8210565.

It is an arithmetic number, because the mean of its divisors is an integer number (8210565).

Almost surely, 2^16421129 is an apocalyptic number.

It is an amenable number.

16421129 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421129 is an equidigital number, since it uses as much as digits as its factorization.

16421129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 16421129 is about 4052.2992238975. The cubic root of 16421129 is about 254.1758810359.

The spelling of 16421129 in words is "sixteen million, four hundred twenty-one thousand, one hundred twenty-nine".