20201201111221 has 4 divisors (see below), whose sum is σ = 21755139658252. Its totient is φ = 18647262564192.

The previous prime is 20201201111183. The next prime is 20201201111293. The reversal of 20201201111221 is 12211110210202.

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 5627024458225 + 14574176652996 = 2372135^2 + 3817614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201201111221 - 2¹⁵ = 20201201078453 is a prime.

It is a super-2 number, since 2×20201201111221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20201201111195 and 20201201111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201201111521) 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, 776969273496 + ... + 776969273521.

It is an arithmetic number, because the mean of its divisors is an integer number (5438784914563).

Almost surely, 2^{20201201111221} is an apocalyptic number.

It is an amenable number.

20201201111221 is a deficient number, since it is larger than the sum of its proper divisors (1553938547031).

20201201111221 is a wasteful number, since it uses less digits than its factorization.

20201201111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553938547030.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20201201111221 its reverse (12211110210202), we get a palindrome (32412311321423).

The spelling of 20201201111221 in words is "twenty trillion, two hundred one billion, two hundred one million, one hundred eleven thousand, two hundred twenty-one".