1220111002121 has 12 divisors (see below), whose sum is σ = 1341277148736. Its totient is φ = 1109056675320.

The previous prime is 1220111002111. The next prime is 1220111002129. The reversal of 1220111002121 is 1212001110221.

It is not a de Polignac number, because 1220111002121 - 2¹⁰ = 1220111001097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220111002096 and 1220111002105.

It is not an unprimeable number, because it can be changed into a prime (1220111002129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 389660 + ... + 1609986.

It is an arithmetic number, because the mean of its divisors is an integer number (111773095728).

Almost surely, 2^{1220111002121} is an apocalyptic number.

1220111002121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220111002121 is a deficient number, since it is larger than the sum of its proper divisors (121166146615).

1220111002121 is a wasteful number, since it uses less digits than its factorization.

1220111002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228612 (or 1228601 counting only the distinct ones).

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

Adding to 1220111002121 its reverse (1212001110221), we get a palindrome (2432112112342).

The spelling of 1220111002121 in words is "one trillion, two hundred twenty billion, one hundred eleven million, two thousand, one hundred twenty-one".