1211201201211 has 16 divisors (see below), whose sum is σ = 1714515400224. Its totient is φ = 757931917824.

The previous prime is 1211201201153. The next prime is 1211201201251. The reversal of 1211201201211 is 1121021021121.

It is a happy number.

It is not a de Polignac number, because 1211201201211 - 2¹³ = 1211201193019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211201201251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31816156 + ... + 31854201.

It is an arithmetic number, because the mean of its divisors is an integer number (107157212514).

Almost surely, 2^{1211201201211} is an apocalyptic number.

1211201201211 is a deficient number, since it is larger than the sum of its proper divisors (503314199013).

1211201201211 is a wasteful number, since it uses less digits than its factorization.

1211201201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63670750.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211201201211 its reverse (1121021021121), we get a palindrome (2332222222332).

The spelling of 1211201201211 in words is "one trillion, two hundred eleven billion, two hundred one million, two hundred one thousand, two hundred eleven".