21200421041 has 2 divisors, whose sum is σ = 21200421042. Its totient is φ = 21200421040.

The previous prime is 21200421031. The next prime is 21200421049. The reversal of 21200421041 is 14012400212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19804651441 + 1395769600 = 140729^2 + 37360^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200421041 - 2³⁰ = 20126679217 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200421049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600210520 + 10600210521.

It is an arithmetic number, because the mean of its divisors is an integer number (10600210521).

Almost surely, 2^21200421041 is an apocalyptic number.

It is an amenable number.

21200421041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200421041 is an equidigital number, since it uses as much as digits as its factorization.

21200421041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21200421041 its reverse (14012400212), we get a palindrome (35212821253).

The spelling of 21200421041 in words is "twenty-one billion, two hundred million, four hundred twenty-one thousand, forty-one".