216820028612 has 12 divisors (see below), whose sum is σ = 413929145616. Its totient is φ = 98554558440.

The previous prime is 216820028609. The next prime is 216820028671.

216820028612 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2463863918 + ... + 2463864005.

It is an arithmetic number, because the mean of its divisors is an integer number (34494095468).

Almost surely, 2^216820028612 is an apocalyptic number.

216820028612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

216820028612 is a deficient number, since it is larger than the sum of its proper divisors (197109117004).

216820028612 is a wasteful number, since it uses less digits than its factorization.

216820028612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927727938 (or 4927727936 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The spelling of 216820028612 in words is "two hundred sixteen billion, eight hundred twenty million, twenty-eight thousand, six hundred twelve".