20020011011221 has 4 divisors (see below), whose sum is σ = 21560011858252. Its totient is φ = 18480010164192.

The previous prime is 20020011011201. The next prime is 20020011011239. The reversal of 20020011011221 is 12211011002002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2929112446225 + 17090898564996 = 1711465^2 + 4134114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020011011221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1540000847017 = 20020011011221 / (2 + 0 + 0 + 2 + 0 + 0 + 1 + 1 + 0 + 1 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020011011201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770000423496 + ... + 770000423521.

It is an arithmetic number, because the mean of its divisors is an integer number (5390002964563).

Almost surely, 2^{20020011011221} is an apocalyptic number.

It is an amenable number.

20020011011221 is a deficient number, since it is larger than the sum of its proper divisors (1540000847031).

20020011011221 is a wasteful number, since it uses less digits than its factorization.

20020011011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540000847030.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20020011011221 its reverse (12211011002002), we get a palindrome (32231022013223).

The spelling of 20020011011221 in words is "twenty trillion, twenty billion, eleven million, eleven thousand, two hundred twenty-one".