20022021022221 has 6 divisors (see below), whose sum is σ = 28920697032110. Its totient is φ = 13348014014808.

The previous prime is 20022021022219. The next prime is 20022021022229. The reversal of 20022021022221 is 12222012022002.

20022021022221 is a `hidden beast` number, since 200 + 220 + 2 + 1 + 0 + 22 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20020130076996 + 1890945225 = 4474386^2 + 43485^2 .

It is not a de Polignac number, because 20022021022221 - 2¹ = 20022021022219 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20022021022194 and 20022021022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022021022229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112334501226 + ... + 1112334501243.

Almost surely, 2^{20022021022221} is an apocalyptic number.

It is an amenable number.

20022021022221 is a deficient number, since it is larger than the sum of its proper divisors (8898676009889).

20022021022221 is a wasteful number, since it uses less digits than its factorization.

20022021022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224669002475 (or 2224669002472 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20022021022221 its reverse (12222012022002), we get a palindrome (32244033044223).

The spelling of 20022021022221 in words is "twenty trillion, twenty-two billion, twenty-one million, twenty-two thousand, two hundred twenty-one".