216821120630 has 16 divisors (see below), whose sum is σ = 392239216800. Its totient is φ = 86292626112.

The previous prime is 216821120609. The next prime is 216821120641. The reversal of 216821120630 is 36021128612.

It is a super-2 number, since 2×216821120630² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 54475679 + ... + 54479658.

It is an arithmetic number, because the mean of its divisors is an integer number (24514951050).

Almost surely, 2^216821120630 is an apocalyptic number.

216821120630 is a deficient number, since it is larger than the sum of its proper divisors (175418096170).

216821120630 is a wasteful number, since it uses less digits than its factorization.

216821120630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108955543.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 216821120630 in words is "two hundred sixteen billion, eight hundred twenty-one million, one hundred twenty thousand, six hundred thirty".