16421977 has 16 divisors (see below), whose sum is σ = 20135808. Its totient is φ = 13178880.

The previous prime is 16421963. The next prime is 16422019. The reversal of 16421977 is 77912461.

It is not a de Polignac number, because 16421977 - 2⁷ = 16421849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16421477) 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 15 ways as a sum of consecutive naturals, for example, 793 + ... + 5785.

It is an arithmetic number, because the mean of its divisors is an integer number (1258488).

Almost surely, 2^16421977 is an apocalyptic number.

It is an amenable number.

16421977 is a deficient number, since it is larger than the sum of its proper divisors (3713831).

16421977 is a wasteful number, since it uses less digits than its factorization.

16421977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5040.

The product of its digits is 21168, while the sum is 37.

The square root of 16421977 is about 4052.4038545041. The cubic root of 16421977 is about 254.1802562414.

The spelling of 16421977 in words is "sixteen million, four hundred twenty-one thousand, nine hundred seventy-seven".