21260554543831 has 2 divisors, whose sum is σ = 21260554543832. Its totient is φ = 21260554543830.

The previous prime is 21260554543799. The next prime is 21260554543853. The reversal of 21260554543831 is 13834545506212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21260554543831 - 2⁵ = 21260554543799 is a prime.

It is a super-2 number, since 2×21260554543831² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21260554543861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10630277271915 + 10630277271916.

It is an arithmetic number, because the mean of its divisors is an integer number (10630277271916).

Almost surely, 2^{21260554543831} is an apocalyptic number.

21260554543831 is a deficient number, since it is larger than the sum of its proper divisors (1).

21260554543831 is an equidigital number, since it uses as much as digits as its factorization.

21260554543831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456000, while the sum is 49.

The spelling of 21260554543831 in words is "twenty-one trillion, two hundred sixty billion, five hundred fifty-four million, five hundred forty-three thousand, eight hundred thirty-one".