1200011121111 has 64 divisors (see below), whose sum is σ = 1832218214400. Its totient is φ = 692026104960.

The previous prime is 1200011121091. The next prime is 1200011121173. The reversal of 1200011121111 is 1111211100021.

It is not a de Polignac number, because 1200011121111 - 2¹⁹ = 1200010596823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200011121181) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 80276940 + ... + 80291886.

It is an arithmetic number, because the mean of its divisors is an integer number (28628409600).

Almost surely, 2^{1200011121111} is an apocalyptic number.

1200011121111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1200011121111 is a deficient number, since it is larger than the sum of its proper divisors (632207093289).

1200011121111 is a wasteful number, since it uses less digits than its factorization.

1200011121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16444.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1200011121111 its reverse (1111211100021), we get a palindrome (2311222221132).

It can be divided in two parts, 12000 and 11121111, that added together give a palindrome (11133111).

The spelling of 1200011121111 in words is "one trillion, two hundred billion, eleven million, one hundred twenty-one thousand, one hundred eleven".