20022022221221 has 4 divisors (see below), whose sum is σ = 21199788234252. Its totient is φ = 18844256208192.

The previous prime is 20022022221211. The next prime is 20022022221239. The reversal of 20022022221221 is 12212222022002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17501580213121 + 2520442008100 = 4183489^2 + 1587590^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022022221221 - 2²² = 20022018026917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20022022221193 and 20022022221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022022221211) 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, 588883006490 + ... + 588883006523.

It is an arithmetic number, because the mean of its divisors is an integer number (5299947058563).

Almost surely, 2^{20022022221221} is an apocalyptic number.

It is an amenable number.

20022022221221 is a deficient number, since it is larger than the sum of its proper divisors (1177766013031).

20022022221221 is a wasteful number, since it uses less digits than its factorization.

20022022221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177766013030.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 20022022221221 its reverse (12212222022002), we get a palindrome (32234244243223).

The spelling of 20022022221221 in words is "twenty trillion, twenty-two billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".