1211201222101 has 4 divisors (see below), whose sum is σ = 1304370546892. Its totient is φ = 1118031897312.

The previous prime is 1211201222039. The next prime is 1211201222137. The reversal of 1211201222101 is 1012221021121.

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 785802467025 + 425398755076 = 886455^2 + 652226^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211201222101 - 2¹⁵ = 1211201189333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211201223101) 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, 46584662376 + ... + 46584662401.

It is an arithmetic number, because the mean of its divisors is an integer number (326092636723).

Almost surely, 2^{1211201222101} is an apocalyptic number.

It is an amenable number.

1211201222101 is a deficient number, since it is larger than the sum of its proper divisors (93169324791).

1211201222101 is an equidigital number, since it uses as much as digits as its factorization.

1211201222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93169324790.

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

Adding to 1211201222101 its reverse (1012221021121), we get a palindrome (2223422243222).

The spelling of 1211201222101 in words is "one trillion, two hundred eleven billion, two hundred one million, two hundred twenty-two thousand, one hundred one".