20012202221021 has 2 divisors, whose sum is σ = 20012202221022. Its totient is φ = 20012202221020.

The previous prime is 20012202220981. The next prime is 20012202221029. The reversal of 20012202221021 is 12012220221002.

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., 16867038302500 + 3145163918521 = 4106950^2 + 1773461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012202221021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012202221029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006101110510 + 10006101110511.

It is an arithmetic number, because the mean of its divisors is an integer number (10006101110511).

Almost surely, 2^{20012202221021} is an apocalyptic number.

It is an amenable number.

20012202221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012202221021 is an equidigital number, since it uses as much as digits as its factorization.

20012202221021 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 20012202221021 its reverse (12012220221002), we get a palindrome (32024422442023).

The spelling of 20012202221021 in words is "twenty trillion, twelve billion, two hundred two million, two hundred twenty-one thousand, twenty-one".