21042125201 has 2 divisors, whose sum is σ = 21042125202. Its totient is φ = 21042125200.

The previous prime is 21042125183. The next prime is 21042125213. The reversal of 21042125201 is 10252124012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19411176976 + 1630948225 = 139324^2 + 40385^2 .

It is a cyclic number.

It is not a de Polignac number, because 21042125201 - 2³⁰ = 19968383377 is a prime.

It is not a weakly prime, because it can be changed into another prime (21042125261) 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, 10521062600 + 10521062601.

It is an arithmetic number, because the mean of its divisors is an integer number (10521062601).

Almost surely, 2^21042125201 is an apocalyptic number.

It is an amenable number.

21042125201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21042125201 is an equidigital number, since it uses as much as digits as its factorization.

21042125201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21042125201 its reverse (10252124012), we get a palindrome (31294249213).

The spelling of 21042125201 in words is "twenty-one billion, forty-two million, one hundred twenty-five thousand, two hundred one".