21012002041 has 2 divisors, whose sum is σ = 21012002042. Its totient is φ = 21012002040.

The previous prime is 21012002021. The next prime is 21012002047. The reversal of 21012002041 is 14020021012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20626704400 + 385297641 = 143620^2 + 19629^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012002041 - 2⁵ = 21012002009 is a prime.

It is a super-3 number, since 3×21012002041³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21012002047) 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, 10506001020 + 10506001021.

It is an arithmetic number, because the mean of its divisors is an integer number (10506001021).

Almost surely, 2^21012002041 is an apocalyptic number.

It is an amenable number.

21012002041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012002041 is an equidigital number, since it uses as much as digits as its factorization.

21012002041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21012002041 its reverse (14020021012), we get a palindrome (35032023053).

The spelling of 21012002041 in words is "twenty-one billion, twelve million, two thousand, forty-one".