1001021111200 has 144 divisors (see below), whose sum is σ = 2705692387104. Its totient is φ = 358574515200.

The previous prime is 1001021111191. The next prime is 1001021111213. The reversal of 1001021111200 is 21111201001.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 259299 + ... + 1438498.

It is an arithmetic number, because the mean of its divisors is an integer number (18789530466).

Almost surely, 2^{1001021111200} is an apocalyptic number.

1001021111200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001021111200 is an abundant number, since it is smaller than the sum of its proper divisors (1704671275904).

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

1001021111200 is a wasteful number, since it uses less digits than its factorization.

1001021111200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697895 (or 1697882 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1001021111200 its reverse (21111201001), we get a palindrome (1022132312201).

The spelling of 1001021111200 in words is "one trillion, one billion, twenty-one million, one hundred eleven thousand, two hundred".