20101101211001 has 4 divisors (see below), whose sum is σ = 20794242632100. Its totient is φ = 19407959789904.

The previous prime is 20101101210997. The next prime is 20101101211019. The reversal of 20101101211001 is 10011210110102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13576019239225 + 6525081971776 = 3684565^2 + 2554424^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101101211001 - 2² = 20101101210997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101101211031) 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, 346570710506 + ... + 346570710563.

It is an arithmetic number, because the mean of its divisors is an integer number (5198560658025).

Almost surely, 2^{20101101211001} is an apocalyptic number.

It is an amenable number.

20101101211001 is a deficient number, since it is larger than the sum of its proper divisors (693141421099).

20101101211001 is an equidigital number, since it uses as much as digits as its factorization.

20101101211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693141421098.

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

Adding to 20101101211001 its reverse (10011210110102), we get a palindrome (30112311321103).

The spelling of 20101101211001 in words is "twenty trillion, one hundred one billion, one hundred one million, two hundred eleven thousand, one".