21112020101101 has 4 divisors (see below), whose sum is σ = 21112033207932. Its totient is φ = 21112006994272.

The previous prime is 21112020101093. The next prime is 21112020101149. The reversal of 21112020101101 is 10110102021112.

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 16423777495876 + 4688242605225 = 4052626^2 + 2165235^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112020101101 - 2³ = 21112020101093 is a prime.

It is a super-2 number, since 2×21112020101101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112020101191) 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, 3732520 + ... + 7493713.

It is an arithmetic number, because the mean of its divisors is an integer number (5278008301983).

Almost surely, 2^{21112020101101} is an apocalyptic number.

It is an amenable number.

21112020101101 is a deficient number, since it is larger than the sum of its proper divisors (13106831).

21112020101101 is a wasteful number, since it uses less digits than its factorization.

21112020101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13106830.

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

Adding to 21112020101101 its reverse (10110102021112), we get a palindrome (31222122122213).

The spelling of 21112020101101 in words is "twenty-one trillion, one hundred twelve billion, twenty million, one hundred one thousand, one hundred one".