20022111002221 has 4 divisors (see below), whose sum is σ = 20022414245244. Its totient is φ = 20021807759200.

The previous prime is 20022111002161. The next prime is 20022111002249. The reversal of 20022111002221 is 12220011122002.

It is a happy number.

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 7864580836996 + 12157530165225 = 2804386^2 + 3486765^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022111002221 - 2¹¹ = 20022111000173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20022111002195 and 20022111002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022111002921) 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, 151522450 + ... + 151654531.

It is an arithmetic number, because the mean of its divisors is an integer number (5005603561311).

Almost surely, 2^{20022111002221} is an apocalyptic number.

It is an amenable number.

20022111002221 is a deficient number, since it is larger than the sum of its proper divisors (303243023).

20022111002221 is an equidigital number, since it uses as much as digits as its factorization.

20022111002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303243022.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20022111002221 its reverse (12220011122002), we get a palindrome (32242122124223).

The spelling of 20022111002221 in words is "twenty trillion, twenty-two billion, one hundred eleven million, two thousand, two hundred twenty-one".