16121604 has 12 divisors (see below), whose sum is σ = 37617104. Its totient is φ = 5373864.

The previous prime is 16121579. The next prime is 16121617. The reversal of 16121604 is 40612161.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×16121604² = 519812231065632, which contains 22 as substring.

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, 671722 + ... + 671745.

Almost surely, 2^16121604 is an apocalyptic number.

It is an amenable number.

16121604 is an abundant number, since it is smaller than the sum of its proper divisors (21495500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16121604 is a wasteful number, since it uses less digits than its factorization.

16121604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343474 (or 1343472 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 16121604 is about 4015.1717273362. The cubic root of 16121604 is about 252.6209804856.

Adding to 16121604 its reverse (40612161), we get a palindrome (56733765).

The spelling of 16121604 in words is "sixteen million, one hundred twenty-one thousand, six hundred four".