21103212041 has 2 divisors, whose sum is σ = 21103212042. Its totient is φ = 21103212040.

The previous prime is 21103212007. The next prime is 21103212073. The reversal of 21103212041 is 14021230112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16373761600 + 4729450441 = 127960^2 + 68771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103212041 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103212341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551606020 + 10551606021.

It is an arithmetic number, because the mean of its divisors is an integer number (10551606021).

Almost surely, 2^21103212041 is an apocalyptic number.

It is an amenable number.

21103212041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103212041 is an equidigital number, since it uses as much as digits as its factorization.

21103212041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21103212041 its reverse (14021230112), we get a palindrome (35124442153).

The spelling of 21103212041 in words is "twenty-one billion, one hundred three million, two hundred twelve thousand, forty-one".