1201021111111 has 8 divisors (see below), whose sum is σ = 1212704288640. Its totient is φ = 1189338371832.

The previous prime is 1201021111099. The next prime is 1201021111133. The reversal of 1201021111111 is 1111111201021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1201021111111 - 2⁵ = 1201021111079 is a prime.

It is a Duffinian number.

1201021111111 is a modest number, since divided by 1111111 gives 120102 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1201021111091 and 1201021111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201021111141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9338280 + ... + 9466018.

It is an arithmetic number, because the mean of its divisors is an integer number (151588036080).

Almost surely, 2^{1201021111111} is an apocalyptic number.

1201021111111 is a deficient number, since it is larger than the sum of its proper divisors (11683177529).

1201021111111 is a wasteful number, since it uses less digits than its factorization.

1201021111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219125.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1201021111111 its reverse (1111111201021), we get a palindrome (2312132312132).

It can be divided in two parts, 1201021 and 111111, that multiplied together give a palindrome (133446644331).

The spelling of 1201021111111 in words is "one trillion, two hundred one billion, twenty-one million, one hundred eleven thousand, one hundred eleven".