16721470 has 16 divisors (see below), whose sum is σ = 30145680. Its totient is φ = 6678144.

The previous prime is 16721461. The next prime is 16721473. The reversal of 16721470 is 7412761.

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 (16721473) 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, 10486 + ... + 11974.

It is an arithmetic number, because the mean of its divisors is an integer number (1884105).

Almost surely, 2^16721470 is an apocalyptic number.

16721470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16721470 is a deficient number, since it is larger than the sum of its proper divisors (13424210).

16721470 is a wasteful number, since it uses less digits than its factorization.

16721470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 16721470 is about 4089.1894062271. The cubic root of 16721470 is about 255.7161465606.

The spelling of 16721470 in words is "sixteen million, seven hundred twenty-one thousand, four hundred seventy".