20001020212221 has 4 divisors (see below), whose sum is σ = 26668026949632. Its totient is φ = 13334013474812.

The previous prime is 20001020212211. The next prime is 20001020212249. The reversal of 20001020212221 is 12221202010002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20001020212221 - 2⁷ = 20001020212093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20001020212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001020212211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3333503368701 + ... + 3333503368706.

It is an arithmetic number, because the mean of its divisors is an integer number (6667006737408).

Almost surely, 2^{20001020212221} is an apocalyptic number.

It is an amenable number.

20001020212221 is a deficient number, since it is larger than the sum of its proper divisors (6667006737411).

20001020212221 is an equidigital number, since it uses as much as digits as its factorization.

20001020212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6667006737410.

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

Adding to 20001020212221 its reverse (12221202010002), we get a palindrome (32222222222223).

The spelling of 20001020212221 in words is "twenty trillion, one billion, twenty million, two hundred twelve thousand, two hundred twenty-one".