20022112021221 has 6 divisors (see below), whose sum is σ = 28920828475110. Its totient is φ = 13348074680808.

The previous prime is 20022112021181. The next prime is 20022112021231. The reversal of 20022112021221 is 12212021122002.

It is a happy number.

20022112021221 is a `hidden beast` number, since 20 + 0 + 221 + 1 + 202 + 1 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19064043005121 + 958069016100 = 4366239^2 + 978810^2 .

It is not a de Polignac number, because 20022112021221 - 2¹⁷ = 20022111890149 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20022112021194 and 20022112021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022112021231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112339556726 + ... + 1112339556743.

It is an arithmetic number, because the mean of its divisors is an integer number (4820138079185).

Almost surely, 2^{20022112021221} is an apocalyptic number.

It is an amenable number.

20022112021221 is a deficient number, since it is larger than the sum of its proper divisors (8898716453889).

20022112021221 is a wasteful number, since it uses less digits than its factorization.

20022112021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224679113475 (or 2224679113472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20022112021221 its reverse (12212021122002), we get a palindrome (32234133143223).

The spelling of 20022112021221 in words is "twenty trillion, twenty-two billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".