10500021 has 12 divisors (see below), whose sum is σ = 17333472. Its totient is φ = 5999976.

The previous prime is 10500013. The next prime is 10500023. The reversal of 10500021 is 12000501.

It is a happy number.

10500021 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10500021 - 2³ = 10500013 is a prime.

It is a super-2 number, since 2×10500021² = 220500882000882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 10499976 and 10500012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10500023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83271 + ... + 83396.

It is an arithmetic number, because the mean of its divisors is an integer number (1444456).

Almost surely, 2^10500021 is an apocalyptic number.

It is an amenable number.

10500021 is a deficient number, since it is larger than the sum of its proper divisors (6833451).

10500021 is a wasteful number, since it uses less digits than its factorization.

10500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166680 (or 166677 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 10500021 is about 3240.3735895727. The cubic root of 10500021 is about 218.9761029783.

Adding to 10500021 its reverse (12000501), we get a palindrome (22500522).

The spelling of 10500021 in words is "ten million, five hundred thousand, twenty-one".