10021645 has 8 divisors (see below), whose sum is σ = 12659040. Its totient is φ = 7595280.

The previous prime is 10021639. The next prime is 10021663. The reversal of 10021645 is 54612001.

10021645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10021645 - 2³ = 10021637 is a prime.

It is a super-3 number, since 3×10021645³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

10021645 is a modest number, since divided by 21645 gives 10 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52651 + ... + 52840.

It is an arithmetic number, because the mean of its divisors is an integer number (1582380).

Almost surely, 2^10021645 is an apocalyptic number.

It is an amenable number.

10021645 is a deficient number, since it is larger than the sum of its proper divisors (2637395).

10021645 is a wasteful number, since it uses less digits than its factorization.

10021645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105515.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 10021645 is about 3165.6981852350. The cubic root of 10021645 is about 215.5987994490.

Adding to 10021645 its reverse (54612001), we get a palindrome (64633646).

The spelling of 10021645 in words is "ten million, twenty-one thousand, six hundred forty-five".