20021012210221 has 16 divisors (see below), whose sum is σ = 22375204286400. Its totient is φ = 17755891977600.

The previous prime is 20021012210219. The next prime is 20021012210233. The reversal of 20021012210221 is 12201221012002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20021012210221 - 2¹ = 20021012210219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021012210195 and 20021012210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021012210261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5930170 + ... + 8672308.

It is an arithmetic number, because the mean of its divisors is an integer number (1398450267900).

Almost surely, 2^{20021012210221} is an apocalyptic number.

It is an amenable number.

20021012210221 is a deficient number, since it is larger than the sum of its proper divisors (2354192076179).

20021012210221 is a wasteful number, since it uses less digits than its factorization.

20021012210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758380.

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

Adding to 20021012210221 its reverse (12201221012002), we get a palindrome (32222233222223).

The spelling of 20021012210221 in words is "twenty trillion, twenty-one billion, twelve million, two hundred ten thousand, two hundred twenty-one".