21250642267 has 2 divisors, whose sum is σ = 21250642268. Its totient is φ = 21250642266.

The previous prime is 21250642159. The next prime is 21250642279. The reversal of 21250642267 is 76224605212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250642267 is a prime.

It is not a weakly prime, because it can be changed into another prime (21250642667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625321133 + 10625321134.

It is an arithmetic number, because the mean of its divisors is an integer number (10625321134).

Almost surely, 2^21250642267 is an apocalyptic number.

21250642267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250642267 is an equidigital number, since it uses as much as digits as its factorization.

21250642267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 21250642267 in words is "twenty-one billion, two hundred fifty million, six hundred forty-two thousand, two hundred sixty-seven".