20112100021221 has 32 divisors (see below), whose sum is σ = 29235673098240. Its totient is φ = 12223869706944.

The previous prime is 20112100021217. The next prime is 20112100021319. The reversal of 20112100021221 is 12212000121102.

It is not a de Polignac number, because 20112100021221 - 2² = 20112100021217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20112100021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112100021421) 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, 9807600 + ... + 11679606.

It is an arithmetic number, because the mean of its divisors is an integer number (913614784320).

Almost surely, 2^{20112100021221} is an apocalyptic number.

It is an amenable number.

20112100021221 is a deficient number, since it is larger than the sum of its proper divisors (9123573077019).

20112100021221 is a wasteful number, since it uses less digits than its factorization.

20112100021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875425.

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

Adding to 20112100021221 its reverse (12212000121102), we get a palindrome (32324100142323).

The spelling of 20112100021221 in words is "twenty trillion, one hundred twelve billion, one hundred million, twenty-one thousand, two hundred twenty-one".