20212000021221 has 16 divisors (see below), whose sum is σ = 27524528652288. Its totient is φ = 13187106644400.

The previous prime is 20212000021211. The next prime is 20212000021247. The reversal of 20212000021221 is 12212000021202.

It is not a de Polignac number, because 20212000021221 - 2⁷ = 20212000021093 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20212000021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212000021211) 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 15 ways as a sum of consecutive naturals, for example, 2540245 + ... + 6846666.

It is an arithmetic number, because the mean of its divisors is an integer number (1720283040768).

Almost surely, 2^{20212000021221} is an apocalyptic number.

It is an amenable number.

20212000021221 is a deficient number, since it is larger than the sum of its proper divisors (7312528631067).

20212000021221 is a wasteful number, since it uses less digits than its factorization.

20212000021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9402232.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20212000021221 its reverse (12212000021202), we get a palindrome (32424000042423).

The spelling of 20212000021221 in words is "twenty trillion, two hundred twelve billion, twenty-one thousand, two hundred twenty-one".