21122020112101 has 4 divisors (see below), whose sum is σ = 21331149024204. Its totient is φ = 20912891200000.

The previous prime is 21122020112009. The next prime is 21122020112143. The reversal of 21122020112101 is 10121102022112.

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 13687972475076 + 7434047637025 = 3699726^2 + 2726545^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122020112101 - 2³³ = 21113430177509 is a prime.

It is a super-2 number, since 2×21122020112101² (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 (21122020112201) 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, 104564455900 + ... + 104564456101.

It is an arithmetic number, because the mean of its divisors is an integer number (5332787256051).

Almost surely, 2^{21122020112101} is an apocalyptic number.

It is an amenable number.

21122020112101 is a deficient number, since it is larger than the sum of its proper divisors (209128912103).

21122020112101 is a wasteful number, since it uses less digits than its factorization.

21122020112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209128912102.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21122020112101 its reverse (10121102022112), we get a palindrome (31243122134213).

The spelling of 21122020112101 in words is "twenty-one trillion, one hundred twenty-two billion, twenty million, one hundred twelve thousand, one hundred one".