21556388314 has 8 divisors (see below), whose sum is σ = 34236616788. Its totient is φ = 10144182720.

The previous prime is 21556388291. The next prime is 21556388339. The reversal of 21556388314 is 41388365512.

It can be written as a sum of positive squares in 2 ways, for example, as 21038052025 + 518336289 = 145045^2 + 22767^2 .

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

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, 317005677 + ... + 317005744.

Almost surely, 2^21556388314 is an apocalyptic number.

21556388314 is a deficient number, since it is larger than the sum of its proper divisors (12680228474).

21556388314 is a wasteful number, since it uses less digits than its factorization.

21556388314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634011440.

The product of its digits is 691200, while the sum is 46.

The spelling of 21556388314 in words is "twenty-one billion, five hundred fifty-six million, three hundred eighty-eight thousand, three hundred fourteen".