1220021011211 has 4 divisors (see below), whose sum is σ = 1284232643400. Its totient is φ = 1155809379024.

The previous prime is 1220021011199. The next prime is 1220021011217. The reversal of 1220021011211 is 1121101200221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220021011211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220021011217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32105816066 + ... + 32105816103.

It is an arithmetic number, because the mean of its divisors is an integer number (321058160850).

Almost surely, 2^{1220021011211} is an apocalyptic number.

1220021011211 is a deficient number, since it is larger than the sum of its proper divisors (64211632189).

1220021011211 is an equidigital number, since it uses as much as digits as its factorization.

1220021011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64211632188.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1220021011211 its reverse (1121101200221), we get a palindrome (2341122211432).

The spelling of 1220021011211 in words is "one trillion, two hundred twenty billion, twenty-one million, eleven thousand, two hundred eleven".