21250253434607 has 2 divisors, whose sum is σ = 21250253434608. Its totient is φ = 21250253434606.

The previous prime is 21250253434603. The next prime is 21250253434723. The reversal of 21250253434607 is 70643435205212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21250253434607 - 2² = 21250253434603 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21250253434601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625126717303 + 10625126717304.

It is an arithmetic number, because the mean of its divisors is an integer number (10625126717304).

Almost surely, 2^{21250253434607} is an apocalyptic number.

21250253434607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250253434607 is an equidigital number, since it uses as much as digits as its factorization.

21250253434607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 44.

Adding to 21250253434607 its reverse (70643435205212), we get a palindrome (91893688639819).

The spelling of 21250253434607 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-three million, four hundred thirty-four thousand, six hundred seven".