1200021222120 has 128 divisors (see below), whose sum is σ = 4115883939840. Its totient is φ = 274188867840.

The previous prime is 1200021222097. The next prime is 1200021222149. The reversal of 1200021222120 is 212221200021.

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 1200021222120.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2013759 + ... + 2540721.

It is an arithmetic number, because the mean of its divisors is an integer number (32155343280).

Almost surely, 2^{1200021222120} is an apocalyptic number.

1200021222120 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 1200021222120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2057941969920).

1200021222120 is an abundant number, since it is smaller than the sum of its proper divisors (2915862717720).

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

1200021222120 is a wasteful number, since it uses less digits than its factorization.

1200021222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529695 (or 529691 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1200021222120 its reverse (212221200021), we get a palindrome (1412242422141).

It can be divided in two parts, 1200021 and 222120, that added together give a triangular number (1422141 = T₁₆₈₆).

The spelling of 1200021222120 in words is "one trillion, two hundred billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty".