1211021111101 has 8 divisors (see below), whose sum is σ = 1264695796224. Its totient is φ = 1157431558800.

The previous prime is 1211021111089. The next prime is 1211021111143. The reversal of 1211021111101 is 1011111201121.

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 1211021111101 - 2³¹ = 1208873627453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211021111501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21254125 + ... + 21311026.

It is an arithmetic number, because the mean of its divisors is an integer number (158086974528).

Almost surely, 2^{1211021111101} is an apocalyptic number.

It is an amenable number.

1211021111101 is a deficient number, since it is larger than the sum of its proper divisors (53674685123).

1211021111101 is a wasteful number, since it uses less digits than its factorization.

1211021111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42566411.

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

Adding to 1211021111101 its reverse (1011111201121), we get a palindrome (2222132312222).

The spelling of 1211021111101 in words is "one trillion, two hundred eleven billion, twenty-one million, one hundred eleven thousand, one hundred one".