16721226101 has 2 divisors, whose sum is σ = 16721226102. Its totient is φ = 16721226100.

The previous prime is 16721226077. The next prime is 16721226131. The reversal of 16721226101 is 10162212761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13869772900 + 2851453201 = 117770^2 + 53399^2 .

It is a cyclic number.

It is not a de Polignac number, because 16721226101 - 2⁶ = 16721226037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16721226131) 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, 8360613050 + 8360613051.

It is an arithmetic number, because the mean of its divisors is an integer number (8360613051).

Almost surely, 2^16721226101 is an apocalyptic number.

It is an amenable number.

16721226101 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721226101 is an equidigital number, since it uses as much as digits as its factorization.

16721226101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

Adding to 16721226101 its reverse (10162212761), we get a palindrome (26883438862).

The spelling of 16721226101 in words is "sixteen billion, seven hundred twenty-one million, two hundred twenty-six thousand, one hundred one".