20011022202221 has 2 divisors, whose sum is σ = 20011022202222. Its totient is φ = 20011022202220.

The previous prime is 20011022202113. The next prime is 20011022202229. The reversal of 20011022202221 is 12220222011002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16191006678025 + 3820015524196 = 4023805^2 + 1954486^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011022202221 - 2¹⁴ = 20011022185837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011022202221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011022202229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005511101110 + 10005511101111.

It is an arithmetic number, because the mean of its divisors is an integer number (10005511101111).

Almost surely, 2^{20011022202221} is an apocalyptic number.

It is an amenable number.

20011022202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011022202221 is an equidigital number, since it uses as much as digits as its factorization.

20011022202221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20011022202221 its reverse (12220222011002), we get a palindrome (32231244213223).

The spelling of 20011022202221 in words is "twenty trillion, eleven billion, twenty-two million, two hundred two thousand, two hundred twenty-one".