20001022012221 has 4 divisors (see below), whose sum is σ = 26668029349632. Its totient is φ = 13334014674812.

The previous prime is 20001022012109. The next prime is 20001022012289. The reversal of 20001022012221 is 12221022010002.

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 20001022012221 - 2¹⁴ = 20001021995837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20001022012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001022011221) 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, 3333503668701 + ... + 3333503668706.

It is an arithmetic number, because the mean of its divisors is an integer number (6667007337408).

Almost surely, 2^{20001022012221} is an apocalyptic number.

It is an amenable number.

20001022012221 is a deficient number, since it is larger than the sum of its proper divisors (6667007337411).

20001022012221 is an equidigital number, since it uses as much as digits as its factorization.

20001022012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667007337410.

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

Adding to 20001022012221 its reverse (12221022010002), we get a palindrome (32222044022223).

The spelling of 20001022012221 in words is "twenty trillion, one billion, twenty-two million, twelve thousand, two hundred twenty-one".