1211000201001 has 12 divisors (see below), whose sum is σ = 1749956585728. Its totient is φ = 806994664344.

The previous prime is 1211000200919. The next prime is 1211000201057. The reversal of 1211000201001 is 1001020001121.

It is a happy number.

It is not a de Polignac number, because 1211000201001 - 2⁷ = 1211000200873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211000200001) 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 11 ways as a sum of consecutive naturals, for example, 28210945 + ... + 28253838.

Almost surely, 2^{1211000201001} is an apocalyptic number.

It is an amenable number.

1211000201001 is a deficient number, since it is larger than the sum of its proper divisors (538956384727).

1211000201001 is a wasteful number, since it uses less digits than its factorization.

1211000201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56467172 (or 56467169 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1211000201001 its reverse (1001020001121), we get a palindrome (2212020202122).

The spelling of 1211000201001 in words is "one trillion, two hundred eleven billion, two hundred one thousand, one".