1011121111001 has 4 divisors (see below), whose sum is σ = 1064338011600. Its totient is φ = 957904210404.

The previous prime is 1011121110971. The next prime is 1011121111067. The reversal of 1011121111001 is 1001111211101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011121111001 is a prime.

It is a super-2 number, since 2×1011121111001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1011121111081) 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, 26608450271 + ... + 26608450308.

It is an arithmetic number, because the mean of its divisors is an integer number (266084502900).

Almost surely, 2^{1011121111001} is an apocalyptic number.

It is an amenable number.

1011121111001 is a deficient number, since it is larger than the sum of its proper divisors (53216900599).

1011121111001 is an equidigital number, since it uses as much as digits as its factorization.

1011121111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53216900598.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 1011121111001 its reverse (1001111211101), we get a palindrome (2012232322102).

The spelling of 1011121111001 in words is "one trillion, eleven billion, one hundred twenty-one million, one hundred eleven thousand, one".