21040513201 has 2 divisors, whose sum is σ = 21040513202. Its totient is φ = 21040513200.

The previous prime is 21040513159. The next prime is 21040513217. The reversal of 21040513201 is 10231504012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10852638976 + 10187874225 = 104176^2 + 100935^2 .

It is a cyclic number.

It is not a de Polignac number, because 21040513201 - 2⁷ = 21040513073 is a prime.

It is a super-2 number, since 2×21040513201² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21040513601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520256600 + 10520256601.

It is an arithmetic number, because the mean of its divisors is an integer number (10520256601).

Almost surely, 2^21040513201 is an apocalyptic number.

It is an amenable number.

21040513201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040513201 is an equidigital number, since it uses as much as digits as its factorization.

21040513201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The spelling of 21040513201 in words is "twenty-one billion, forty million, five hundred thirteen thousand, two hundred one".