1221202111120 has 80 divisors (see below), whose sum is σ = 2864837745792. Its totient is φ = 484096471040.

The previous prime is 1221202110979. The next prime is 1221202111123. The reversal of 1221202111120 is 211112021221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1221202111094 and 1221202111103.

It is not an unprimeable number, because it can be changed into a prime (1221202111123) 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, 7708224 + ... + 7865056.

Almost surely, 2^{1221202111120} is an apocalyptic number.

1221202111120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221202111120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1432418872896).

1221202111120 is an abundant number, since it is smaller than the sum of its proper divisors (1643635634672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221202111120 is a wasteful number, since it uses less digits than its factorization.

1221202111120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157720 (or 157714 counting only the distinct ones).

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

Adding to 1221202111120 its reverse (211112021221), we get a palindrome (1432314132341).

The spelling of 1221202111120 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred eleven thousand, one hundred twenty".