1021222111200 has 144 divisors (see below), whose sum is σ = 3413918214000. Its totient is φ = 264965713920.

The previous prime is 1021222111199. The next prime is 1021222111201. The reversal of 1021222111200 is 21112221201.

It is an interprime number because it is at equal distance from previous prime (1021222111199) and next prime (1021222111201).

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 1021222111200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222111201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5661325 + ... + 5838924.

It is an arithmetic number, because the mean of its divisors is an integer number (23707765375).

Almost surely, 2^{1021222111200} is an apocalyptic number.

1021222111200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021222111200 is an abundant number, since it is smaller than the sum of its proper divisors (2392696102800).

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

1021222111200 is a wasteful number, since it uses less digits than its factorization.

1021222111200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11500309 (or 11500296 counting only the distinct ones).

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

Adding to 1021222111200 its reverse (21112221201), we get a palindrome (1042334332401).

The spelling of 1021222111200 in words is "one trillion, twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, two hundred".