16204621 has 8 divisors (see below), whose sum is σ = 17229240. Its totient is φ = 15187968.

The previous prime is 16204619. The next prime is 16204633. The reversal of 16204621 is 12640261.

It can be written as a sum of positive squares in 4 ways, for example, as 7502121 + 8702500 = 2739^2 + 2950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16204621 - 2¹ = 16204619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16204592 and 16204601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16204651) 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, 2515 + ... + 6223.

It is an arithmetic number, because the mean of its divisors is an integer number (2153655).

Almost surely, 2^16204621 is an apocalyptic number.

It is an amenable number.

16204621 is a deficient number, since it is larger than the sum of its proper divisors (1024619).

16204621 is a wasteful number, since it uses less digits than its factorization.

16204621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3983.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 16204621 is about 4025.4963669093. The cubic root of 16204621 is about 253.0538559598.

Adding to 16204621 its reverse (12640261), we get a palindrome (28844882).

It can be divided in two parts, 1620 and 4621, that added together give a square (6241 = 79²).

The spelling of 16204621 in words is "sixteen million, two hundred four thousand, six hundred twenty-one".