10651221 has 12 divisors (see below), whose sum is σ = 17583072. Its totient is φ = 6086376.

The previous prime is 10651219. The next prime is 10651247. The reversal of 10651221 is 12215601.

10651221 is a `hidden beast` number, since 10 + 651 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 10651221 - 2¹ = 10651219 is a prime.

It is a super-2 number, since 2×10651221² = 226897017581682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10651194 and 10651203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10651621) 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, 84471 + ... + 84596.

It is an arithmetic number, because the mean of its divisors is an integer number (1465256).

Almost surely, 2^10651221 is an apocalyptic number.

It is an amenable number.

10651221 is a deficient number, since it is larger than the sum of its proper divisors (6931851).

10651221 is a wasteful number, since it uses less digits than its factorization.

10651221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169080 (or 169077 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 10651221 is about 3263.6208419484. The cubic root of 10651221 is about 220.0221809592.

Adding to 10651221 its reverse (12215601), we get a palindrome (22866822).

The spelling of 10651221 in words is "ten million, six hundred fifty-one thousand, two hundred twenty-one".