20011201111221 has 32 divisors (see below), whose sum is σ = 28959177646080. Its totient is φ = 12254859988800.

The previous prime is 20011201111201. The next prime is 20011201111271. The reversal of 20011201111221 is 12211110211002.

It is a happy number.

It is not a de Polignac number, because 20011201111221 - 2⁷ = 20011201111093 is a prime.

It is a super-2 number, since 2×20011201111221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20011201111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011201111201) 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 31 ways as a sum of consecutive naturals, for example, 35427426 + ... + 35987843.

It is an arithmetic number, because the mean of its divisors is an integer number (904974301440).

Almost surely, 2^{20011201111221} is an apocalyptic number.

It is an amenable number.

20011201111221 is a deficient number, since it is larger than the sum of its proper divisors (8947976534859).

20011201111221 is a wasteful number, since it uses less digits than its factorization.

20011201111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71415457.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20011201111221 its reverse (12211110211002), we get a palindrome (32222311322223).

The spelling of 20011201111221 in words is "twenty trillion, eleven billion, two hundred one million, one hundred eleven thousand, two hundred twenty-one".