1001200122000 has 320 divisors, whose sum is σ = 3862410289920. Its totient is φ = 246449088000.

The previous prime is 1001200121989. The next prime is 1001200122017. The reversal of 1001200122000 is 2210021001.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11106 + ... + 1415105.

It is an arithmetic number, because the mean of its divisors is an integer number (12070032156).

Almost surely, 2^{1001200122000} is an apocalyptic number.

1001200122000 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 1001200122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1931205144960).

1001200122000 is an abundant number, since it is smaller than the sum of its proper divisors (2861210167920).

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

1001200122000 is a wasteful number, since it uses less digits than its factorization.

1001200122000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426256 (or 1426234 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1001200122000 its reverse (2210021001), we get a palindrome (1003410143001).

The spelling of 1001200122000 in words is "one trillion, one billion, two hundred million, one hundred twenty-two thousand".