21022112101 has 2 divisors, whose sum is σ = 21022112102. Its totient is φ = 21022112100.

The previous prime is 21022112077. The next prime is 21022112117. The reversal of 21022112101 is 10121122012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19239077025 + 1783035076 = 138705^2 + 42226^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022112101 - 2³³ = 12432177509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022118101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511056050 + 10511056051.

It is an arithmetic number, because the mean of its divisors is an integer number (10511056051).

Almost surely, 2^21022112101 is an apocalyptic number.

It is an amenable number.

21022112101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022112101 is an equidigital number, since it uses as much as digits as its factorization.

21022112101 is an evil number, because the sum of its binary digits is even.

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

Adding to 21022112101 its reverse (10121122012), we get a palindrome (31143234113).

The spelling of 21022112101 in words is "twenty-one billion, twenty-two million, one hundred twelve thousand, one hundred one".