216621243630 has 192 divisors, whose sum is σ = 625651693056. Its totient is φ = 51559200000.

The previous prime is 216621243571. The next prime is 216621243701. The reversal of 216621243630 is 36342126612.

216621243630 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 2 + 12 + 4 + 3 + 630 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20623380 + ... + 20633880.

It is an arithmetic number, because the mean of its divisors is an integer number (3258602568).

Almost surely, 2^216621243630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216621243630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312825846528).

216621243630 is an abundant number, since it is smaller than the sum of its proper divisors (409030449426).

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

216621243630 is a wasteful number, since it uses less digits than its factorization.

216621243630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10903 (or 10900 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The spelling of 216621243630 in words is "two hundred sixteen billion, six hundred twenty-one million, two hundred forty-three thousand, six hundred thirty".