10001212221221 has 16 divisors (see below), whose sum is σ = 10788841728000. Its totient is φ = 9216203008320.

The previous prime is 10001212221211. The next prime is 10001212221251. The reversal of 10001212221221 is 12212221210001.

It is a cyclic number.

It is not a de Polignac number, because 10001212221221 - 2³⁴ = 9984032352037 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 10001212221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001212221211) 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, 47181530 + ... + 47393028.

It is an arithmetic number, because the mean of its divisors is an integer number (674302608000).

Almost surely, 2^{10001212221221} is an apocalyptic number.

It is an amenable number.

10001212221221 is a deficient number, since it is larger than the sum of its proper divisors (787629506779).

10001212221221 is a wasteful number, since it uses less digits than its factorization.

10001212221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217676.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 10001212221221 its reverse (12212221210001), we get a palindrome (22213433431222).

The spelling of 10001212221221 in words is "ten trillion, one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".