1201221101011 has 4 divisors (see below), whose sum is σ = 1201235694624. Its totient is φ = 1201206507400.

The previous prime is 1201221100997. The next prime is 1201221101023. The reversal of 1201221101011 is 1101011221021.

It is a happy number.

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 1201221101011 - 2³¹ = 1199073617363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201221100982 and 1201221101000.

It is not an unprimeable number, because it can be changed into a prime (1201221101051) 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, 7172635 + ... + 7338196.

It is an arithmetic number, because the mean of its divisors is an integer number (300308923656).

Almost surely, 2^{1201221101011} is an apocalyptic number.

1201221101011 is a deficient number, since it is larger than the sum of its proper divisors (14593613).

1201221101011 is an equidigital number, since it uses as much as digits as its factorization.

1201221101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14593612.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1201221101011 its reverse (1101011221021), we get a palindrome (2302232322032).

The spelling of 1201221101011 in words is "one trillion, two hundred one billion, two hundred twenty-one million, one hundred one thousand, eleven".