1220031221111 has 4 divisors (see below), whose sum is σ = 1228110898224. Its totient is φ = 1211951544000.

The previous prime is 1220031221083. The next prime is 1220031221131. The reversal of 1220031221111 is 1111221300221.

It is a happy number.

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 1220031221111 - 2¹⁴ = 1220031204727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220031221111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220031221131) 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, 4039838330 + ... + 4039838631.

It is an arithmetic number, because the mean of its divisors is an integer number (307027724556).

Almost surely, 2^{1220031221111} is an apocalyptic number.

1220031221111 is a deficient number, since it is larger than the sum of its proper divisors (8079677113).

1220031221111 is an equidigital number, since it uses as much as digits as its factorization.

1220031221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8079677112.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1220031221111 its reverse (1111221300221), we get a palindrome (2331252521332).

The spelling of 1220031221111 in words is "one trillion, two hundred twenty billion, thirty-one million, two hundred twenty-one thousand, one hundred eleven".