21260554543031 has 2 divisors, whose sum is σ = 21260554543032. Its totient is φ = 21260554543030.

The previous prime is 21260554542961. The next prime is 21260554543049. The reversal of 21260554543031 is 13034545506212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21260554543031 is a prime.

It is a super-2 number, since 2×21260554543031² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21260554543031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21260554543831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10630277271515 + 10630277271516.

It is an arithmetic number, because the mean of its divisors is an integer number (10630277271516).

Almost surely, 2^{21260554543031} is an apocalyptic number.

21260554543031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21260554543031 is an equidigital number, since it uses as much as digits as its factorization.

21260554543031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 21260554543031 in words is "twenty-one trillion, two hundred sixty billion, five hundred fifty-four million, five hundred forty-three thousand, thirty-one".