20111001021001 has 16 divisors (see below), whose sum is σ = 22223325616128. Its totient is φ = 18047002636800.

The previous prime is 20111001020899. The next prime is 20111001021029. The reversal of 20111001021001 is 10012010011102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111001021001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111001001001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24197310 + ... + 25014631.

It is an arithmetic number, because the mean of its divisors is an integer number (1388957851008).

Almost surely, 2^{20111001021001} is an apocalyptic number.

It is an amenable number.

20111001021001 is a deficient number, since it is larger than the sum of its proper divisors (2112324595127).

20111001021001 is a wasteful number, since it uses less digits than its factorization.

20111001021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49212432.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20111001021001 its reverse (10012010011102), we get a palindrome (30123011032103).

The spelling of 20111001021001 in words is "twenty trillion, one hundred eleven billion, one million, twenty-one thousand, one".