20021201221247 has 2 divisors, whose sum is σ = 20021201221248. Its totient is φ = 20021201221246.

The previous prime is 20021201221159. The next prime is 20021201221267. The reversal of 20021201221247 is 74212210212002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20021201221247 - 2⁸ = 20021201220991 is a prime.

It is a super-3 number, since 3×20021201221247³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021201221267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010600610623 + 10010600610624.

It is an arithmetic number, because the mean of its divisors is an integer number (10010600610624).

Almost surely, 2^{20021201221247} is an apocalyptic number.

20021201221247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021201221247 is an equidigital number, since it uses as much as digits as its factorization.

20021201221247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 26.

Adding to 20021201221247 its reverse (74212210212002), we get a palindrome (94233411433249).

The spelling of 20021201221247 in words is "twenty trillion, twenty-one billion, two hundred one million, two hundred twenty-one thousand, two hundred forty-seven".