20110102021221 has 32 divisors (see below), whose sum is σ = 27117264706560. Its totient is φ = 13255341714816.

The previous prime is 20110102021201. The next prime is 20110102021231. The reversal of 20110102021221 is 12212020101102.

It is a de Polignac number, because none of the positive numbers 2^k-20110102021221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20110102021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110102021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 860534425 + ... + 860557793.

It is an arithmetic number, because the mean of its divisors is an integer number (847414522080).

Almost surely, 2^{20110102021221} is an apocalyptic number.

It is an amenable number.

20110102021221 is a deficient number, since it is larger than the sum of its proper divisors (7007162685339).

20110102021221 is a wasteful number, since it uses less digits than its factorization.

20110102021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28633.

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

Adding to 20110102021221 its reverse (12212020101102), we get a palindrome (32322122122323).

The spelling of 20110102021221 in words is "twenty trillion, one hundred ten billion, one hundred two million, twenty-one thousand, two hundred twenty-one".