1211000212201 has 6 divisors (see below), whose sum is σ = 1311319756590. Its totient is φ = 1117846349568.

The previous prime is 1211000212157. The next prime is 1211000212223. The reversal of 1211000212201 is 1022120001121.

It can be written as a sum of positive squares in 3 ways, for example, as 42328947600 + 1168671264601 = 205740^2 + 1081051^2 .

It is not a de Polignac number, because 1211000212201 - 2²¹ = 1210998115049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211000212601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3582840696 + ... + 3582841033.

It is an arithmetic number, because the mean of its divisors is an integer number (218553292765).

Almost surely, 2^{1211000212201} is an apocalyptic number.

It is an amenable number.

1211000212201 is a deficient number, since it is larger than the sum of its proper divisors (100319544389).

1211000212201 is an equidigital number, since it uses as much as digits as its factorization.

1211000212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7165681755 (or 7165681742 counting only the distinct ones).

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

Adding to 1211000212201 its reverse (1022120001121), we get a palindrome (2233120213322).

The spelling of 1211000212201 in words is "one trillion, two hundred eleven billion, two hundred twelve thousand, two hundred one".