21233122201157 has 2 divisors, whose sum is σ = 21233122201158. Its totient is φ = 21233122201156.

The previous prime is 21233122201139. The next prime is 21233122201199. The reversal of 21233122201157 is 75110222133212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17004481075201 + 4228641125956 = 4123649^2 + 2056366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21233122201157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233122801157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616561100578 + 10616561100579.

It is an arithmetic number, because the mean of its divisors is an integer number (10616561100579).

Almost surely, 2^{21233122201157} is an apocalyptic number.

It is an amenable number.

21233122201157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233122201157 is an equidigital number, since it uses as much as digits as its factorization.

21233122201157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

Adding to 21233122201157 its reverse (75110222133212), we get a palindrome (96343344334369).

The spelling of 21233122201157 in words is "twenty-one trillion, two hundred thirty-three billion, one hundred twenty-two million, two hundred one thousand, one hundred fifty-seven".