20101210220101 has 4 divisors (see below), whose sum is σ = 20102656260204. Its totient is φ = 20099764180000.

The previous prime is 20101210220093. The next prime is 20101210220107. The reversal of 20101210220101 is 10102201210102.

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 18300205959876 + 1801004260225 = 4277874^2 + 1342015^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101210220101 - 2³ = 20101210220093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101210220107) 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, 722999200 + ... + 723027001.

It is an arithmetic number, because the mean of its divisors is an integer number (5025664065051).

Almost surely, 2^{20101210220101} is an apocalyptic number.

It is an amenable number.

20101210220101 is a deficient number, since it is larger than the sum of its proper divisors (1446040103).

20101210220101 is a wasteful number, since it uses less digits than its factorization.

20101210220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446040102.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20101210220101 its reverse (10102201210102), we get a palindrome (30203411430203).

Subtracting from 20101210220101 its reverse (10102201210102), we obtain a palindrome (9999009009999).

The spelling of 20101210220101 in words is "twenty trillion, one hundred one billion, two hundred ten million, two hundred twenty thousand, one hundred one".