21012122041 has 2 divisors, whose sum is σ = 21012122042. Its totient is φ = 21012122040.

The previous prime is 21012122003. The next prime is 21012122063. The reversal of 21012122041 is 14022121012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16302182400 + 4709939641 = 127680^2 + 68629^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012122041 - 2¹⁷ = 21011990969 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012122071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506061020 + 10506061021.

It is an arithmetic number, because the mean of its divisors is an integer number (10506061021).

Almost surely, 2^21012122041 is an apocalyptic number.

It is an amenable number.

21012122041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012122041 is an equidigital number, since it uses as much as digits as its factorization.

21012122041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21012122041 its reverse (14022121012), we get a palindrome (35034243053).

The spelling of 21012122041 in words is "twenty-one billion, twelve million, one hundred twenty-two thousand, forty-one".