1220111221021 has 16 divisors (see below), whose sum is σ = 1526037648768. Its totient is φ = 947698502400.

The previous prime is 1220111220989. The next prime is 1220111221031. The reversal of 1220111221021 is 1201221110221.

It is a cyclic number.

It is not a de Polignac number, because 1220111221021 - 2⁵ = 1220111220989 is a prime.

It is a super-2 number, since 2×1220111221021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220111220986 and 1220111221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220111221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25288360 + ... + 25336561.

It is an arithmetic number, because the mean of its divisors is an integer number (95377353048).

Almost surely, 2^{1220111221021} is an apocalyptic number.

1220111221021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220111221021 is a deficient number, since it is larger than the sum of its proper divisors (305926427747).

1220111221021 is a wasteful number, since it uses less digits than its factorization.

1220111221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50625252.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1220111221021 its reverse (1201221110221), we get a palindrome (2421332331242).

The spelling of 1220111221021 in words is "one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, twenty-one".