20112102100221 has 16 divisors (see below), whose sum is σ = 27543401277504. Its totient is φ = 13044501408384.

The previous prime is 20112102100219. The next prime is 20112102100241. The reversal of 20112102100221 is 12200120121102.

It is not a de Polignac number, because 20112102100221 - 2¹ = 20112102100219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20112102100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112102100241) 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, 7012336 + ... + 9455001.

It is an arithmetic number, because the mean of its divisors is an integer number (1721462579844).

Almost surely, 2^{20112102100221} is an apocalyptic number.

It is an amenable number.

20112102100221 is a deficient number, since it is larger than the sum of its proper divisors (7431299177283).

20112102100221 is a wasteful number, since it uses less digits than its factorization.

20112102100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16478380.

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

Adding to 20112102100221 its reverse (12200120121102), we get a palindrome (32312222221323).

The spelling of 20112102100221 in words is "twenty trillion, one hundred twelve billion, one hundred two million, one hundred thousand, two hundred twenty-one".