16421529 has 24 divisors (see below), whose sum is σ = 23591520. Its totient is φ = 10156032.

The previous prime is 16421527. The next prime is 16421543. The reversal of 16421529 is 92512461.

It is not a de Polignac number, because 16421529 - 2¹ = 16421527 is a prime.

It is a super-2 number, since 2×16421529² = 539333229395682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16421496 and 16421505.

It is not an unprimeable number, because it can be changed into a prime (16421521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63769 + ... + 64025.

It is an arithmetic number, because the mean of its divisors is an integer number (982980).

Almost surely, 2^16421529 is an apocalyptic number.

16421529 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16421529 is a deficient number, since it is larger than the sum of its proper divisors (7169991).

16421529 is a wasteful number, since it uses less digits than its factorization.

16421529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 338 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 16421529 is about 4052.3485782938. The cubic root of 16421529 is about 254.1779448308.

The spelling of 16421529 in words is "sixteen million, four hundred twenty-one thousand, five hundred twenty-nine".