21258714133 has 2 divisors, whose sum is σ = 21258714134. Its totient is φ = 21258714132.

The previous prime is 21258714119. The next prime is 21258714181. The reversal of 21258714133 is 33141785212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19088738244 + 2169975889 = 138162^2 + 46583^2 .

It is a cyclic number.

It is not a de Polignac number, because 21258714133 - 2¹⁷ = 21258583061 is a prime.

It is a super-2 number, since 2×21258714133² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21258714092 and 21258714101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21258717133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10629357066 + 10629357067.

It is an arithmetic number, because the mean of its divisors is an integer number (10629357067).

Almost surely, 2^21258714133 is an apocalyptic number.

It is an amenable number.

21258714133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21258714133 is an equidigital number, since it uses as much as digits as its factorization.

21258714133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The spelling of 21258714133 in words is "twenty-one billion, two hundred fifty-eight million, seven hundred fourteen thousand, one hundred thirty-three".