16721270 has 16 divisors (see below), whose sum is σ = 30149280. Its totient is φ = 6677184.

The previous prime is 16721267. The next prime is 16721279. The reversal of 16721270 is 7212761.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7394 + ... + 9386.

It is an arithmetic number, because the mean of its divisors is an integer number (1884330).

Almost surely, 2^16721270 is an apocalyptic number.

16721270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16721270 is a deficient number, since it is larger than the sum of its proper divisors (13428010).

16721270 is a wasteful number, since it uses less digits than its factorization.

16721270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 16721270 is about 4089.1649514296. The cubic root of 16721270 is about 255.7151270443.

The spelling of 16721270 in words is "sixteen million, seven hundred twenty-one thousand, two hundred seventy".