20111002111001 has 4 divisors (see below), whose sum is σ = 20113087675152. Its totient is φ = 20108916546852.

The previous prime is 20111002110971. The next prime is 20111002111021. The reversal of 20111002111001 is 10011120011102.

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 20111002111001 - 2⁴² = 15712955599897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111002111021) 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, 1042767611 + ... + 1042786896.

It is an arithmetic number, because the mean of its divisors is an integer number (5028271918788).

Almost surely, 2^{20111002111001} is an apocalyptic number.

It is an amenable number.

20111002111001 is a deficient number, since it is larger than the sum of its proper divisors (2085564151).

20111002111001 is an equidigital number, since it uses as much as digits as its factorization.

20111002111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085564150.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20111002111001 its reverse (10011120011102), we get a palindrome (30122122122103).

The spelling of 20111002111001 in words is "twenty trillion, one hundred eleven billion, two million, one hundred eleven thousand, one".