21112421101 has 2 divisors, whose sum is σ = 21112421102. Its totient is φ = 21112421100.

The previous prime is 21112421081. The next prime is 21112421131. The reversal of 21112421101 is 10112421112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12106600900 + 9005820201 = 110030^2 + 94899^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112421101 - 2¹⁵ = 21112388333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112421131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556210550 + 10556210551.

It is an arithmetic number, because the mean of its divisors is an integer number (10556210551).

Almost surely, 2^21112421101 is an apocalyptic number.

It is an amenable number.

21112421101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112421101 is an equidigital number, since it uses as much as digits as its factorization.

21112421101 is an evil number, because the sum of its binary digits is even.

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

Adding to 21112421101 its reverse (10112421112), we get a palindrome (31224842213).

The spelling of 21112421101 in words is "twenty-one billion, one hundred twelve million, four hundred twenty-one thousand, one hundred one".