201211022101 has 4 divisors (see below), whose sum is σ = 201224197900. Its totient is φ = 201197846304.

The previous prime is 201211022099. The next prime is 201211022137. The reversal of 201211022101 is 101220112102.

201211022101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 148587120900 + 52623901201 = 385470^2 + 229399^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211022101 - 2¹ = 201211022099 is a prime.

It is a super-2 number, since 2×201211022101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211028101) 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, 6564966 + ... + 6595543.

It is an arithmetic number, because the mean of its divisors is an integer number (50306049475).

Almost surely, 2^201211022101 is an apocalyptic number.

It is an amenable number.

201211022101 is a deficient number, since it is larger than the sum of its proper divisors (13175799).

201211022101 is a wasteful number, since it uses less digits than its factorization.

201211022101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13175798.

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

Adding to 201211022101 its reverse (101220112102), we get a palindrome (302431134203).

Subtracting from 201211022101 its reverse (101220112102), we obtain a palindrome (99990909999).

The spelling of 201211022101 in words is "two hundred one billion, two hundred eleven million, twenty-two thousand, one hundred one".