1201221111211 has 4 divisors (see below), whose sum is σ = 1310423030424. Its totient is φ = 1092019192000.

The previous prime is 1201221111199. The next prime is 1201221111217. The reversal of 1201221111211 is 1121111221021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1201221111211 - 2⁵ = 1201221111179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201221111217) 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, 54600959590 + ... + 54600959611.

It is an arithmetic number, because the mean of its divisors is an integer number (327605757606).

Almost surely, 2^{1201221111211} is an apocalyptic number.

1201221111211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1201221111211 is a deficient number, since it is larger than the sum of its proper divisors (109201919213).

1201221111211 is a wasteful number, since it uses less digits than its factorization.

1201221111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109201919212.

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

Adding to 1201221111211 its reverse (1121111221021), we get a palindrome (2322332332232).

The spelling of 1201221111211 in words is "one trillion, two hundred one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred eleven".