21254016355367 has 2 divisors, whose sum is σ = 21254016355368. Its totient is φ = 21254016355366.

The previous prime is 21254016355291. The next prime is 21254016355441. The reversal of 21254016355367 is 76355361045212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21254016355367 - 2²⁰ = 21254015306791 is a prime.

It is a super-2 number, since 2×21254016355367² (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 (21254016355867) 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, 10627008177683 + 10627008177684.

It is an arithmetic number, because the mean of its divisors is an integer number (10627008177684).

Almost surely, 2^{21254016355367} is an apocalyptic number.

21254016355367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21254016355367 is an equidigital number, since it uses as much as digits as its factorization.

21254016355367 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536000, while the sum is 50.

The spelling of 21254016355367 in words is "twenty-one trillion, two hundred fifty-four billion, sixteen million, three hundred fifty-five thousand, three hundred sixty-seven".