20101101211021 has 4 divisors (see below), whose sum is σ = 20430627460444. Its totient is φ = 19771574961600.

The previous prime is 20101101211019. The next prime is 20101101211031. The reversal of 20101101211021 is 12011210110102.

It is a happy number.

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 7471535694921 + 12629565516100 = 2733411^2 + 3553810^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101101211021 - 2¹ = 20101101211019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101101210992 and 20101101211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101101211031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164763124620 + ... + 164763124741.

It is an arithmetic number, because the mean of its divisors is an integer number (5107656865111).

Almost surely, 2^{20101101211021} is an apocalyptic number.

It is an amenable number.

20101101211021 is a deficient number, since it is larger than the sum of its proper divisors (329526249423).

20101101211021 is an equidigital number, since it uses as much as digits as its factorization.

20101101211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329526249422.

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

Adding to 20101101211021 its reverse (12011210110102), we get a palindrome (32112311321123).

The spelling of 20101101211021 in words is "twenty trillion, one hundred one billion, one hundred one million, two hundred eleven thousand, twenty-one".