1220211232111 has 4 divisors (see below), whose sum is σ = 1220219888800. Its totient is φ = 1220202575424.

The previous prime is 1220211232099. The next prime is 1220211232129. The reversal of 1220211232111 is 1112321120221.

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

It is a cyclic number.

It is not a de Polignac number, because 1220211232111 - 2⁷ = 1220211231983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220211232211) 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, 4113351 + ... + 4400008.

It is an arithmetic number, because the mean of its divisors is an integer number (305054972200).

Almost surely, 2^{1220211232111} is an apocalyptic number.

1220211232111 is a deficient number, since it is larger than the sum of its proper divisors (8656689).

1220211232111 is an equidigital number, since it uses as much as digits as its factorization.

1220211232111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8656688.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1220211232111 its reverse (1112321120221), we get a palindrome (2332532352332).

The spelling of 1220211232111 in words is "one trillion, two hundred twenty billion, two hundred eleven million, two hundred thirty-two thousand, one hundred eleven".