10581921 has 24 divisors (see below), whose sum is σ = 18118464. Its totient is φ = 6045840.

The previous prime is 10581899. The next prime is 10581937. The reversal of 10581921 is 12918501.

10581921 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10581921 - 2⁷ = 10581793 is a prime.

It is a super-2 number, since 2×10581921² = 223954104100482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

10581921 is strictly pandigital in base 8.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (10581521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1410 + ... + 4811.

It is an arithmetic number, because the mean of its divisors is an integer number (754936).

Almost surely, 2^10581921 is an apocalyptic number.

It is an amenable number.

10581921 is a deficient number, since it is larger than the sum of its proper divisors (7536543).

10581921 is an frugal number, since it uses more digits than its factorization.

10581921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6243 (or 6231 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 10581921 is about 3252.9864739959. The cubic root of 10581921 is about 219.5439658161.

The spelling of 10581921 in words is "ten million, five hundred eighty-one thousand, nine hundred twenty-one".