20121201100221 has 32 divisors (see below), whose sum is σ = 29025205708800. Its totient is φ = 12325299940800.

The previous prime is 20121201100171. The next prime is 20121201100249. The reversal of 20121201100221 is 12200110212102.

It is not a de Polignac number, because 20121201100221 - 2¹⁵ = 20121201067453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121201100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121201110221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6910480 + ... + 9380678.

It is an arithmetic number, because the mean of its divisors is an integer number (907037678400).

Almost surely, 2^{20121201100221} is an apocalyptic number.

It is an amenable number.

20121201100221 is a deficient number, since it is larger than the sum of its proper divisors (8904004608579).

20121201100221 is a wasteful number, since it uses less digits than its factorization.

20121201100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471177.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20121201100221 its reverse (12200110212102), we get a palindrome (32321311312323).

The spelling of 20121201100221 in words is "twenty trillion, one hundred twenty-one billion, two hundred one million, one hundred thousand, two hundred twenty-one".