21422555305 has 4 divisors (see below), whose sum is σ = 25707066372. Its totient is φ = 17138044240.

The previous prime is 21422555293. The next prime is 21422555333. The reversal of 21422555305 is 50355522412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3215910681 + 18206644624 = 56709^2 + 134932^2 .

It is not a de Polignac number, because 21422555305 - 2⁹ = 21422554793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2142255526 + ... + 2142255535.

It is an arithmetic number, because the mean of its divisors is an integer number (6426766593).

Almost surely, 2^21422555305 is an apocalyptic number.

It is an amenable number.

21422555305 is a deficient number, since it is larger than the sum of its proper divisors (4284511067).

21422555305 is an equidigital number, since it uses as much as digits as its factorization.

21422555305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4284511066.

The product of its (nonzero) digits is 60000, while the sum is 34.

The spelling of 21422555305 in words is "twenty-one billion, four hundred twenty-two million, five hundred fifty-five thousand, three hundred five".