1001200121011 has 4 divisors (see below), whose sum is σ = 1001935758024. Its totient is φ = 1000464484000.

The previous prime is 1001200120993. The next prime is 1001200121057. The reversal of 1001200121011 is 1101210021001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1001200121011 - 2¹³ = 1001200112819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001200121111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367816465 + ... + 367819186.

It is an arithmetic number, because the mean of its divisors is an integer number (250483939506).

Almost surely, 2^{1001200121011} is an apocalyptic number.

1001200121011 is a deficient number, since it is larger than the sum of its proper divisors (735637013).

1001200121011 is an equidigital number, since it uses as much as digits as its factorization.

1001200121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735637012.

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

Adding to 1001200121011 its reverse (1101210021001), we get a palindrome (2102410142012).

It can be divided in two parts, 1001200 and 121011, that added together give a palindrome (1122211).

The spelling of 1001200121011 in words is "one trillion, one billion, two hundred million, one hundred twenty-one thousand, eleven".