1001122011121 has 4 divisors (see below), whose sum is σ = 1001323570752. Its totient is φ = 1000920451492.

The previous prime is 1001122011119. The next prime is 1001122011137. The reversal of 1001122011121 is 1211102211001.

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 not a de Polignac number, because 1001122011121 - 2¹ = 1001122011119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001122011821) 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, 100772365 + ... + 100782298.

It is an arithmetic number, because the mean of its divisors is an integer number (250330892688).

Almost surely, 2^{1001122011121} is an apocalyptic number.

It is an amenable number.

1001122011121 is a deficient number, since it is larger than the sum of its proper divisors (201559631).

1001122011121 is an equidigital number, since it uses as much as digits as its factorization.

1001122011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201559630.

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

Adding to 1001122011121 its reverse (1211102211001), we get a palindrome (2212224222122).

The spelling of 1001122011121 in words is "one trillion, one billion, one hundred twenty-two million, eleven thousand, one hundred twenty-one".