10016621 has 4 divisors (see below), whose sum is σ = 10605852. Its totient is φ = 9427392.

The previous prime is 10016563. The next prime is 10016623. The reversal of 10016621 is 12661001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12661001 = 47 ⋅269383.

It can be written as a sum of positive squares in 2 ways, for example, as 3960100 + 6056521 = 1990^2 + 2461^2 .

It is a cyclic number.

It is not a de Polignac number, because 10016621 - 2⁶ = 10016557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 589213 = 10016621 / (1 + 0 + 0 + 1 + 6 + 6 + 2 + 1).

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 10016621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10016623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294590 + ... + 294623.

It is an arithmetic number, because the mean of its divisors is an integer number (2651463).

Almost surely, 2^10016621 is an apocalyptic number.

It is an amenable number.

10016621 is a deficient number, since it is larger than the sum of its proper divisors (589231).

10016621 is an equidigital number, since it uses as much as digits as its factorization.

10016621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589230.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 10016621 is about 3164.9045799202. The cubic root of 10016621 is about 215.5627657965.

Adding to 10016621 its reverse (12661001), we get a palindrome (22677622).

The spelling of 10016621 in words is "ten million, sixteen thousand, six hundred twenty-one".