20120121100221 has 8 divisors (see below), whose sum is σ = 27481141015104. Its totient is φ = 13086257626080.

The previous prime is 20120121100187. The next prime is 20120121100237. The reversal of 20120121100221 is 12200112102102.

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

It is not a de Polignac number, because 20120121100221 - 2¹¹ = 20120121098173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20120121100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120121100421) 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, 81789110041 + ... + 81789110286.

It is an arithmetic number, because the mean of its divisors is an integer number (3435142626888).

Almost surely, 2^{20120121100221} is an apocalyptic number.

It is an amenable number.

20120121100221 is a deficient number, since it is larger than the sum of its proper divisors (7361019914883).

20120121100221 is a wasteful number, since it uses less digits than its factorization.

20120121100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163578220371.

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

Adding to 20120121100221 its reverse (12200112102102), we get a palindrome (32320233202323).

The spelling of 20120121100221 in words is "twenty trillion, one hundred twenty billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-one".