16821164 has 12 divisors (see below), whose sum is σ = 29553384. Its totient is φ = 8377344.

The previous prime is 16821139. The next prime is 16821173. The reversal of 16821164 is 46112861.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7154 + ... + 9209.

It is an arithmetic number, because the mean of its divisors is an integer number (2462782).

Almost surely, 2^16821164 is an apocalyptic number.

It is an amenable number.

16821164 is a deficient number, since it is larger than the sum of its proper divisors (12732220).

16821164 is a wasteful number, since it uses less digits than its factorization.

16821164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16624 (or 16622 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 16821164 is about 4101.3612374430. The cubic root of 16821164 is about 256.2233361905.

The spelling of 16821164 in words is "sixteen million, eight hundred twenty-one thousand, one hundred sixty-four".