1220111331211 has 2 divisors, whose sum is σ = 1220111331212. Its totient is φ = 1220111331210.

The previous prime is 1220111331199. The next prime is 1220111331239. The reversal of 1220111331211 is 1121331110221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220111331211 - 2¹³ = 1220111323019 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220111331251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610055665605 + 610055665606.

It is an arithmetic number, because the mean of its divisors is an integer number (610055665606).

Almost surely, 2^{1220111331211} is an apocalyptic number.

1220111331211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220111331211 is an equidigital number, since it uses as much as digits as its factorization.

1220111331211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1220111331211 its reverse (1121331110221), we get a palindrome (2341442441432).

The spelling of 1220111331211 in words is "one trillion, two hundred twenty billion, one hundred eleven million, three hundred thirty-one thousand, two hundred eleven".