21511010041 has 2 divisors, whose sum is σ = 21511010042. Its totient is φ = 21511010040.

The previous prime is 21511010029. The next prime is 21511010057. The reversal of 21511010041 is 14001011512.

It is an a-pointer prime, because the next prime (21511010057) can be obtained adding 21511010041 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14521214016 + 6989796025 = 120504^2 + 83605^2 .

It is a cyclic number.

It is not a de Polignac number, because 21511010041 - 2¹³ = 21511001849 is a prime.

It is a super-3 number, since 3×21511010041³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21511009997 and 21511010024.

It is not a weakly prime, because it can be changed into another prime (21511010141) 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, 10755505020 + 10755505021.

It is an arithmetic number, because the mean of its divisors is an integer number (10755505021).

Almost surely, 2^21511010041 is an apocalyptic number.

It is an amenable number.

21511010041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21511010041 is an equidigital number, since it uses as much as digits as its factorization.

21511010041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 21511010041 its reverse (14001011512), we get a palindrome (35512021553).

The spelling of 21511010041 in words is "twenty-one billion, five hundred eleven million, ten thousand, forty-one".