1221202101120 has 256 divisors, whose sum is σ = 4062465057600. Its totient is φ = 311640326144.

The previous prime is 1221202101107. The next prime is 1221202101127. The reversal of 1221202101120 is 211012021221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1221202101120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221202101127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6194794 + ... + 6388886.

Almost surely, 2^{1221202101120} is an apocalyptic number.

1221202101120 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 1221202101120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2031232528800).

1221202101120 is an abundant number, since it is smaller than the sum of its proper divisors (2841262956480).

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

1221202101120 is a wasteful number, since it uses less digits than its factorization.

1221202101120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194257 (or 194245 counting only the distinct ones).

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

Adding to 1221202101120 its reverse (211012021221), we get a palindrome (1432214122341).

The spelling of 1221202101120 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred one thousand, one hundred twenty".