201101022111221 has 4 divisors (see below), whose sum is σ = 201102035142732. Its totient is φ = 201100009079712.

The previous prime is 201101022111169. The next prime is 201101022111251. The reversal of 201101022111221 is 122111220101102.

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 192026703316900 + 9074318794321 = 13857370^2 + 3012361^2 .

It is a cyclic number.

It is not a de Polignac number, because 201101022111221 - 2²² = 201101017916917 is a prime.

It is a super-2 number, since 2×201101022111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201101022111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201101022111251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506217926 + ... + 506615031.

It is an arithmetic number, because the mean of its divisors is an integer number (50275508785683).

Almost surely, 2^{201101022111221} is an apocalyptic number.

It is an amenable number.

201101022111221 is a deficient number, since it is larger than the sum of its proper divisors (1013031511).

201101022111221 is a wasteful number, since it uses less digits than its factorization.

201101022111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013031510.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 201101022111221 its reverse (122111220101102), we get a palindrome (323212242212323).

The spelling of 201101022111221 in words is "two hundred one trillion, one hundred one billion, twenty-two million, one hundred eleven thousand, two hundred twenty-one".