1211220211201 has 32 divisors (see below), whose sum is σ = 1626672902400. Its totient is φ = 870982778880.

The previous prime is 1211220211169. The next prime is 1211220211237. The reversal of 1211220211201 is 1021120221121.

It is a cyclic number.

It is not a de Polignac number, because 1211220211201 - 2⁵ = 1211220211169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211220221201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3778945 + ... + 4086913.

It is an arithmetic number, because the mean of its divisors is an integer number (50833528200).

Almost surely, 2^{1211220211201} is an apocalyptic number.

1211220211201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211220211201 is a deficient number, since it is larger than the sum of its proper divisors (415452691199).

1211220211201 is a wasteful number, since it uses less digits than its factorization.

1211220211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311929.

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

Adding to 1211220211201 its reverse (1021120221121), we get a palindrome (2232340432322).

The spelling of 1211220211201 in words is "one trillion, two hundred eleven billion, two hundred twenty million, two hundred eleven thousand, two hundred one".