1220220021111 has 16 divisors (see below), whose sum is σ = 2002412342784. Its totient is φ = 643632538464.

The previous prime is 1220220021109. The next prime is 1220220021113. The reversal of 1220220021111 is 1111200220221.

It is an interprime number because it is at equal distance from previous prime (1220220021109) and next prime (1220220021113).

It is not a de Polignac number, because 1220220021111 - 2¹ = 1220220021109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220220021113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2234834931 + ... + 2234835476.

It is an arithmetic number, because the mean of its divisors is an integer number (125150771424).

Almost surely, 2^{1220220021111} is an apocalyptic number.

1220220021111 is a deficient number, since it is larger than the sum of its proper divisors (782192321673).

1220220021111 is a wasteful number, since it uses less digits than its factorization.

1220220021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4469670430.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1220220021111 its reverse (1111200220221), we get a palindrome (2331420241332).

The spelling of 1220220021111 in words is "one trillion, two hundred twenty billion, two hundred twenty million, twenty-one thousand, one hundred eleven".