20012211001221 has 8 divisors (see below), whose sum is σ = 26682979646880. Its totient is φ = 13341458178192.

The previous prime is 20012211001219. The next prime is 20012211001291. The reversal of 20012211001221 is 12210011221002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20012211001221 - 2¹ = 20012211001219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012211001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012211001291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597130 + ... + 6354603.

It is an arithmetic number, because the mean of its divisors is an integer number (3335372455860).

Almost surely, 2^{20012211001221} is an apocalyptic number.

It is an amenable number.

20012211001221 is a deficient number, since it is larger than the sum of its proper divisors (6670768645659).

20012211001221 is an equidigital number, since it uses as much as digits as its factorization.

20012211001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7911315.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20012211001221 its reverse (12210011221002), we get a palindrome (32222222222223).

The spelling of 20012211001221 in words is "twenty trillion, twelve billion, two hundred eleven million, one thousand, two hundred twenty-one".