10187621 has 4 divisors (see below), whose sum is σ = 10202700. Its totient is φ = 10172544.

The previous prime is 10187599. The next prime is 10187647. The reversal of 10187621 is 12678101.

10187621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12678101 = 31 ⋅408971.

It can be written as a sum of positive squares in 2 ways, for example, as 3556996 + 6630625 = 1886^2 + 2575^2 .

It is a cyclic number.

It is not a de Polignac number, because 10187621 - 2¹⁴ = 10171237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10187651) 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, 6476 + ... + 7893.

It is an arithmetic number, because the mean of its divisors is an integer number (2550675).

Almost surely, 2^10187621 is an apocalyptic number.

It is an amenable number.

10187621 is a deficient number, since it is larger than the sum of its proper divisors (15079).

10187621 is an equidigital number, since it uses as much as digits as its factorization.

10187621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15078.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 10187621 is about 3191.8052885475. The cubic root of 10187621 is about 216.7825197641.

The spelling of 10187621 in words is "ten million, one hundred eighty-seven thousand, six hundred twenty-one".