21126552101 has 2 divisors, whose sum is σ = 21126552102. Its totient is φ = 21126552100.

The previous prime is 21126552077. The next prime is 21126552107. The reversal of 21126552101 is 10125562112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20893257025 + 233295076 = 144545^2 + 15274^2 .

It is a cyclic number.

It is not a de Polignac number, because 21126552101 - 2²² = 21122357797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21126552107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563276050 + 10563276051.

It is an arithmetic number, because the mean of its divisors is an integer number (10563276051).

Almost surely, 2^21126552101 is an apocalyptic number.

It is an amenable number.

21126552101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126552101 is an equidigital number, since it uses as much as digits as its factorization.

21126552101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 26.

The spelling of 21126552101 in words is "twenty-one billion, one hundred twenty-six million, five hundred fifty-two thousand, one hundred one".