20021221101101 has 32 divisors (see below), whose sum is σ = 23047900102656. Its totient is φ = 17222509296000.

The previous prime is 20021221101071. The next prime is 20021221101169. The reversal of 20021221101101 is 10110112212002.

It is not a de Polignac number, because 20021221101101 - 2¹⁰ = 20021221100077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021221131101) 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, 15951236 + ... + 17160546.

It is an arithmetic number, because the mean of its divisors is an integer number (720246878208).

Almost surely, 2^{20021221101101} is an apocalyptic number.

It is an amenable number.

20021221101101 is a deficient number, since it is larger than the sum of its proper divisors (3026679001555).

20021221101101 is a wasteful number, since it uses less digits than its factorization.

20021221101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210433.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20021221101101 its reverse (10110112212002), we get a palindrome (30131333313103).

It can be divided in two parts, 20021 and 221101101, that added together give a palindrome (221121122).

The spelling of 20021221101101 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred one thousand, one hundred one".