21634271842408 has 32 divisors (see below), whose sum is σ = 43997963191560. Its totient is φ = 9932520785920.

The previous prime is 21634271842343. The next prime is 21634271842423. The reversal of 21634271842408 is 80424817243612.

It can be written as a sum of positive squares in 4 ways, for example, as 10837514193444 + 10796757648964 = 3292038^2 + 3285842^2 .

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, 1939939891 + ... + 1939951042.

Almost surely, 2^{21634271842408} is an apocalyptic number.

It is an amenable number.

21634271842408 is an abundant number, since it is smaller than the sum of its proper divisors (22363691349152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21634271842408 is a wasteful number, since it uses less digits than its factorization.

21634271842408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3879890997 (or 3879890993 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 52.

The spelling of 21634271842408 in words is "twenty-one trillion, six hundred thirty-four billion, two hundred seventy-one million, eight hundred forty-two thousand, four hundred eight".