20012201221221 has 32 divisors (see below), whose sum is σ = 32732625623040. Its totient is φ = 11982478993200.

The previous prime is 20012201221189. The next prime is 20012201221241. The reversal of 20012201221221 is 12212210221002.

It is a happy number.

20012201221221 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 220 + 1 + 221 + 221 = 666.

It is not a de Polignac number, because 20012201221221 - 2⁵ = 20012201221189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012201221194 and 20012201221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012201221241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 405885885 + ... + 405935186.

It is an arithmetic number, because the mean of its divisors is an integer number (1022894550720).

Almost surely, 2^{20012201221221} is an apocalyptic number.

It is an amenable number.

20012201221221 is a deficient number, since it is larger than the sum of its proper divisors (12720424401819).

20012201221221 is a wasteful number, since it uses less digits than its factorization.

20012201221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811821174 (or 811821168 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20012201221221 its reverse (12212210221002), we get a palindrome (32224411442223).

The spelling of 20012201221221 in words is "twenty trillion, twelve billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-one".