21550322604 has 24 divisors (see below), whose sum is σ = 52470351360. Its totient is φ = 6871117264.

The previous prime is 21550322593. The next prime is 21550322639. The reversal of 21550322604 is 40622305512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39040164 + ... + 39040715.

It is an arithmetic number, because the mean of its divisors is an integer number (2186264640).

Almost surely, 2^21550322604 is an apocalyptic number.

It is an amenable number.

21550322604 is an abundant number, since it is smaller than the sum of its proper divisors (30920028756).

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

21550322604 is a wasteful number, since it uses less digits than its factorization.

21550322604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78080909 (or 78080907 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21550322604 in words is "twenty-one billion, five hundred fifty million, three hundred twenty-two thousand, six hundred four".