20021220110321 has 4 divisors (see below), whose sum is σ = 21074968537200. Its totient is φ = 18967471683444.

The previous prime is 20021220110273. The next prime is 20021220110329. The reversal of 20021220110321 is 12301102212002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20021220110321 - 2⁶ = 20021220110257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021220110321.

It is not an unprimeable number, because it can be changed into a prime (20021220110329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526874213411 + ... + 526874213448.

It is an arithmetic number, because the mean of its divisors is an integer number (5268742134300).

Almost surely, 2^{20021220110321} is an apocalyptic number.

It is an amenable number.

20021220110321 is a deficient number, since it is larger than the sum of its proper divisors (1053748426879).

20021220110321 is a wasteful number, since it uses less digits than its factorization.

20021220110321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053748426878.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20021220110321 its reverse (12301102212002), we get a palindrome (32322322322323).

The spelling of 20021220110321 in words is "twenty trillion, twenty-one billion, two hundred twenty million, one hundred ten thousand, three hundred twenty-one".