20012222020221 has 12 divisors (see below), whose sum is σ = 28920623092348. Its totient is φ = 13334982804864.

The previous prime is 20012222020199. The next prime is 20012222020277. The reversal of 20012222020221 is 12202022221002.

20012222020221 is a `hidden beast` number, since 20 + 0 + 1 + 222 + 202 + 0 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9836032700025 + 10176189320196 = 3136245^2 + 3190014^2 .

It is not a de Polignac number, because 20012222020221 - 2¹⁹ = 20012221495933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012222020194 and 20012222020203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012222020121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 541525660 + ... + 541562613.

Almost surely, 2^{20012222020221} is an apocalyptic number.

It is an amenable number.

20012222020221 is a deficient number, since it is larger than the sum of its proper divisors (8908401072127).

20012222020221 is a wasteful number, since it uses less digits than its factorization.

20012222020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083090332 (or 1083090329 counting only the distinct ones).

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

Adding to 20012222020221 its reverse (12202022221002), we get a palindrome (32214244241223).

The spelling of 20012222020221 in words is "twenty trillion, twelve billion, two hundred twenty-two million, twenty thousand, two hundred twenty-one".