16977021 has 8 divisors (see below), whose sum is σ = 22922880. Its totient is φ = 11174592.

The previous prime is 16977001. The next prime is 16977029. The reversal of 16977021 is 12077961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16977021 - 2⁶ = 16976957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16977029) 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 in 7 ways as a sum of consecutive naturals, for example, 35580 + ... + 36053.

It is an arithmetic number, because the mean of its divisors is an integer number (2865360).

Almost surely, 2^16977021 is an apocalyptic number.

It is an amenable number.

16977021 is a deficient number, since it is larger than the sum of its proper divisors (5945859).

16977021 is an equidigital number, since it uses as much as digits as its factorization.

16977021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71715.

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 16977021 is about 4120.3180702465. The cubic root of 16977021 is about 257.0122529448.

The spelling of 16977021 in words is "sixteen million, nine hundred seventy-seven thousand, twenty-one".