21250225666667 has 2 divisors, whose sum is σ = 21250225666668. Its totient is φ = 21250225666666.

The previous prime is 21250225666643. The next prime is 21250225666669. The reversal of 21250225666667 is 76666652205212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250225666667 is a prime.

Together with 21250225666669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21250225666669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625112833333 + 10625112833334.

It is an arithmetic number, because the mean of its divisors is an integer number (10625112833334).

Almost surely, 2^{21250225666667} is an apocalyptic number.

21250225666667 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250225666667 is an equidigital number, since it uses as much as digits as its factorization.

21250225666667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 56.

The spelling of 21250225666667 in words is "twenty-one trillion, two hundred fifty billion, two hundred twenty-five million, six hundred sixty-six thousand, six hundred sixty-seven".