21250225666543 has 2 divisors, whose sum is σ = 21250225666544. Its totient is φ = 21250225666542.

The previous prime is 21250225666531. The next prime is 21250225666589. The reversal of 21250225666543 is 34566652205212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21250225666543 - 2³⁷ = 21112786713071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21250225666513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625112833271 + 10625112833272.

It is an arithmetic number, because the mean of its divisors is an integer number (10625112833272).

Almost surely, 2^{21250225666543} is an apocalyptic number.

21250225666543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250225666543 is an equidigital number, since it uses as much as digits as its factorization.

21250225666543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 21250225666543 in words is "twenty-one trillion, two hundred fifty billion, two hundred twenty-five million, six hundred sixty-six thousand, five hundred forty-three".