10621 has 8 divisors (see below), whose sum is σ = 12320. Its totient is φ = 9072.

The previous prime is 10613. The next prime is 10627. The reversal of 10621 is 12601.

10621 = 14² + 15² + ... + 32².

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 10621 - 2³ = 10613 is a prime.

It is a super-2 number, since 2×10621² = 225611282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10598 and 10607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10627) 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, 226 + ... + 268.

It is an arithmetic number, because the mean of its divisors is an integer number (1540).

10621 is the 60-th hex number.

It is an amenable number.

10621 is a deficient number, since it is larger than the sum of its proper divisors (1699).

10621 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (10620) it forms an eRAP, since the sums of their prime factors are consecutive (74 and 75).

10621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 10621 is about 103.0582359639. The cubic root of 10621 is about 21.9813892194.

Subtracting from 10621 its product of nonzero digits (12), we obtain a square (10609 = 103²).

The spelling of 10621 in words is "ten thousand, six hundred twenty-one".