16057621 has 4 divisors (see below), whose sum is σ = 16077600. Its totient is φ = 16037644.

The previous prime is 16057607. The next prime is 16057627. The reversal of 16057621 is 12675061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12675061 = 7 ⋅1810723.

It is a cyclic number.

It is not a de Polignac number, because 16057621 - 2⁷ = 16057493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16057621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16057627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8731 + ... + 10408.

It is an arithmetic number, because the mean of its divisors is an integer number (4019400).

Almost surely, 2^16057621 is an apocalyptic number.

It is an amenable number.

16057621 is a deficient number, since it is larger than the sum of its proper divisors (19979).

16057621 is an equidigital number, since it uses as much as digits as its factorization.

16057621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19978.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 16057621 is about 4007.1961519247. The cubic root of 16057621 is about 252.2863388769.

The spelling of 16057621 in words is "sixteen million, fifty-seven thousand, six hundred twenty-one".