16421559 has 16 divisors (see below), whose sum is σ = 27298560. Its totient is φ = 8530560.

The previous prime is 16421549. The next prime is 16421579. The reversal of 16421559 is 95512461.

It is not a de Polignac number, because 16421559 - 2⁴ = 16421543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35314 + ... + 35775.

It is an arithmetic number, because the mean of its divisors is an integer number (1706160).

Almost surely, 2^16421559 is an apocalyptic number.

16421559 is a deficient number, since it is larger than the sum of its proper divisors (10877001).

16421559 is a wasteful number, since it uses less digits than its factorization.

16421559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71110.

The product of its digits is 10800, while the sum is 33.

The square root of 16421559 is about 4052.3522798493. The cubic root of 16421559 is about 254.1780996141.

The spelling of 16421559 in words is "sixteen million, four hundred twenty-one thousand, five hundred fifty-nine".