21125764207 has 2 divisors, whose sum is σ = 21125764208. Its totient is φ = 21125764206.

The previous prime is 21125764133. The next prime is 21125764217. The reversal of 21125764207 is 70246752112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21125764207 - 2¹⁵ = 21125731439 is a prime.

It is a super-3 number, since 3×21125764207³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21125764217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562882103 + 10562882104.

It is an arithmetic number, because the mean of its divisors is an integer number (10562882104).

Almost surely, 2^21125764207 is an apocalyptic number.

21125764207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21125764207 is an equidigital number, since it uses as much as digits as its factorization.

21125764207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 21125764207 in words is "twenty-one billion, one hundred twenty-five million, seven hundred sixty-four thousand, two hundred seven".