21201122113 has 2 divisors, whose sum is σ = 21201122114. Its totient is φ = 21201122112.

The previous prime is 21201122077. The next prime is 21201122123. The reversal of 21201122113 is 31122110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12903369649 + 8297752464 = 113593^2 + 91092^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201122113 - 2³³ = 12611187521 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201122123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600561056 + 10600561057.

It is an arithmetic number, because the mean of its divisors is an integer number (10600561057).

Almost surely, 2^21201122113 is an apocalyptic number.

It is an amenable number.

21201122113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201122113 is an equidigital number, since it uses as much as digits as its factorization.

21201122113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21201122113 its reverse (31122110212), we get a palindrome (52323232325).

The spelling of 21201122113 in words is "twenty-one billion, two hundred one million, one hundred twenty-two thousand, one hundred thirteen".