10221661 has 8 divisors (see below), whose sum is σ = 10600704. Its totient is φ = 9845760.

The previous prime is 10221649. The next prime is 10221671. The reversal of 10221661 is 16612201.

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

It is a cyclic number.

It is not a de Polignac number, because 10221661 - 2⁹ = 10221149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221671) 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, 7326 + ... + 8608.

It is an arithmetic number, because the mean of its divisors is an integer number (1325088).

Almost surely, 2^10221661 is an apocalyptic number.

It is an amenable number.

10221661 is a deficient number, since it is larger than the sum of its proper divisors (379043).

10221661 is a wasteful number, since it uses less digits than its factorization.

10221661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 10221661 is about 3197.1332471450. The cubic root of 10221661 is about 217.0236972146.

Adding to 10221661 its reverse (16612201), we get a palindrome (26833862).

The spelling of 10221661 in words is "ten million, two hundred twenty-one thousand, six hundred sixty-one".