16221470 has 16 divisors (see below), whose sum is σ = 29484000. Its totient is φ = 6425184.

The previous prime is 16221467. The next prime is 16221487. The reversal of 16221470 is 7412261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6845 + ... + 8904.

It is an arithmetic number, because the mean of its divisors is an integer number (1842750).

Almost surely, 2^16221470 is an apocalyptic number.

16221470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16221470 is a deficient number, since it is larger than the sum of its proper divisors (13262530).

16221470 is a wasteful number, since it uses less digits than its factorization.

16221470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15859.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 16221470 is about 4027.5886085845. The cubic root of 16221470 is about 253.1415311055.

The spelling of 16221470 in words is "sixteen million, two hundred twenty-one thousand, four hundred seventy".