20022120201221 has 4 divisors (see below), whose sum is σ = 20209242820032. Its totient is φ = 19834997582412.

The previous prime is 20022120201203. The next prime is 20022120201227. The reversal of 20022120201221 is 12210202122002.

It is a happy number.

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 20022120201221 - 2⁶ = 20022120201157 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 20022120201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022120201227) 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, 93561309245 + ... + 93561309458.

It is an arithmetic number, because the mean of its divisors is an integer number (5052310705008).

Almost surely, 2^{20022120201221} is an apocalyptic number.

It is an amenable number.

20022120201221 is a deficient number, since it is larger than the sum of its proper divisors (187122618811).

20022120201221 is a wasteful number, since it uses less digits than its factorization.

20022120201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187122618810.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20022120201221 its reverse (12210202122002), we get a palindrome (32232322323223).

The spelling of 20022120201221 in words is "twenty trillion, twenty-two billion, one hundred twenty million, two hundred one thousand, two hundred twenty-one".