21430026605 has 8 divisors (see below), whose sum is σ = 27694188312. Its totient is φ = 15825250368.

The previous prime is 21430026599. The next prime is 21430026623. The reversal of 21430026605 is 50662003412.

It can be written as a sum of positive squares in 4 ways, for example, as 213773641 + 21216252964 = 14621^2 + 145658^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21430026605 - 2¹⁴ = 21430010221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164846294 + ... + 164846423.

It is an arithmetic number, because the mean of its divisors is an integer number (3461773539).

Almost surely, 2^21430026605 is an apocalyptic number.

It is an amenable number.

21430026605 is a deficient number, since it is larger than the sum of its proper divisors (6264161707).

21430026605 is a wasteful number, since it uses less digits than its factorization.

21430026605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329692735.

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 21430026605 in words is "twenty-one billion, four hundred thirty million, twenty-six thousand, six hundred five".