1011321031200 has 72 divisors (see below), whose sum is σ = 3291849964368. Its totient is φ = 269685607680.

The previous prime is 1011321031187. The next prime is 1011321031211. The reversal of 1011321031200 is 21301231101.

It is a happy number.

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 1011321031200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210689482 + ... + 210694281.

It is an arithmetic number, because the mean of its divisors is an integer number (45720138394).

Almost surely, 2^{1011321031200} is an apocalyptic number.

1011321031200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011321031200 is an abundant number, since it is smaller than the sum of its proper divisors (2280528933168).

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

1011321031200 is a wasteful number, since it uses less digits than its factorization.

1011321031200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421383786 (or 421383773 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1011321031200 its reverse (21301231101), we get a palindrome (1032622262301).

The spelling of 1011321031200 in words is "one trillion, eleven billion, three hundred twenty-one million, thirty-one thousand, two hundred".