10031221 has 8 divisors (see below), whose sum is σ = 10588320. Its totient is φ = 9477072.

The previous prime is 10031191. The next prime is 10031227. The reversal of 10031221 is 12213001.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10031221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10031198 and 10031207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10031227) 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, 12591 + ... + 13363.

It is an arithmetic number, because the mean of its divisors is an integer number (1323540).

Almost surely, 2^10031221 is an apocalyptic number.

It is an amenable number.

10031221 is a deficient number, since it is larger than the sum of its proper divisors (557099).

10031221 is an equidigital number, since it uses as much as digits as its factorization.

10031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475.

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

The square root of 10031221 is about 3167.2102866719. The cubic root of 10031221 is about 215.6674480878.

Adding to 10031221 its reverse (12213001), we get a palindrome (22244222).

The spelling of 10031221 in words is "ten million, thirty-one thousand, two hundred twenty-one".