21555616230 has 48 divisors (see below), whose sum is σ = 56052678240. Its totient is φ = 5747336064.

The previous prime is 21555616211. The next prime is 21555616249. The reversal of 21555616230 is 3261655512.

21555616230 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 5 + 616 + 2 + 30 = 666.

It is an interprime number because it is at equal distance from previous prime (21555616211) and next prime (21555616249).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 853626 + ... + 878514.

It is an arithmetic number, because the mean of its divisors is an integer number (1167764130).

Almost surely, 2^21555616230 is an apocalyptic number.

21555616230 is an abundant number, since it is smaller than the sum of its proper divisors (34497062010).

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

21555616230 is a wasteful number, since it uses less digits than its factorization.

21555616230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34525 (or 34522 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 21555616230 in words is "twenty-one billion, five hundred fifty-five million, six hundred sixteen thousand, two hundred thirty".