21558120284234 has 8 divisors (see below), whose sum is σ = 34239367510308. Its totient is φ = 10144997780800.

The previous prime is 21558120284209. The next prime is 21558120284263. The reversal of 21558120284234 is 43248202185512.

It can be written as a sum of positive squares in 2 ways, for example, as 19138393815025 + 2419726469209 = 4374745^2 + 1555547^2 .

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

It is a Curzon number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 317031180617 + ... + 317031180684.

Almost surely, 2^{21558120284234} is an apocalyptic number.

21558120284234 is a deficient number, since it is larger than the sum of its proper divisors (12681247226074).

21558120284234 is a wasteful number, since it uses less digits than its factorization.

21558120284234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634062361320.

The product of its (nonzero) digits is 1228800, while the sum is 47.

The spelling of 21558120284234 in words is "twenty-one trillion, five hundred fifty-eight billion, one hundred twenty million, two hundred eighty-four thousand, two hundred thirty-four".