1001121200 has 30 divisors (see below), whose sum is σ = 2405194644. Its totient is φ = 400448320.

The previous prime is 1001121193. The next prime is 1001121283. The reversal of 1001121200 is 21211001.

It is a super-3 number, since 3×1001121200³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1251002 + ... + 1251801.

Almost surely, 2^1001121200 is an apocalyptic number.

1001121200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001121200 is an abundant number, since it is smaller than the sum of its proper divisors (1404073444).

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

1001121200 is a wasteful number, since it uses less digits than its factorization.

1001121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502821 (or 2502810 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1001121200 is about 31640.4993639481. The cubic root of 1001121200 is about 1000.3735937437.

Adding to 1001121200 its reverse (21211001), we get a palindrome (1022332201).

The spelling of 1001121200 in words is "one billion, one million, one hundred twenty-one thousand, two hundred".