10213221221 has 16 divisors (see below), whose sum is σ = 12293107200. Its totient is φ = 8289038448.

The previous prime is 10213221217. The next prime is 10213221229. The reversal of 10213221221 is 12212231201.

It is a cyclic number.

It is not a de Polignac number, because 10213221221 - 2² = 10213221217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10213221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10213221229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243806 + ... + 282608.

It is an arithmetic number, because the mean of its divisors is an integer number (768319200).

Almost surely, 2^10213221221 is an apocalyptic number.

It is an amenable number.

10213221221 is a deficient number, since it is larger than the sum of its proper divisors (2079885979).

10213221221 is a wasteful number, since it uses less digits than its factorization.

10213221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40808.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 10213221221 its reverse (12212231201), we get a palindrome (22425452422).

The spelling of 10213221221 in words is "ten billion, two hundred thirteen million, two hundred twenty-one thousand, two hundred twenty-one".