21450420359 has 2 divisors, whose sum is σ = 21450420360. Its totient is φ = 21450420358.

The previous prime is 21450420347. The next prime is 21450420371. The reversal of 21450420359 is 95302405412.

It is a balanced prime because it is at equal distance from previous prime (21450420347) and next prime (21450420371).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21450420359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450420319) 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, 10725210179 + 10725210180.

It is an arithmetic number, because the mean of its divisors is an integer number (10725210180).

Almost surely, 2^21450420359 is an apocalyptic number.

21450420359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450420359 is an equidigital number, since it uses as much as digits as its factorization.

21450420359 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21450420359 in words is "twenty-one billion, four hundred fifty million, four hundred twenty thousand, three hundred fifty-nine".