217428920000 has 70 divisors (see below), whose sum is σ = 539153156388. Its totient is φ = 86971552000.

The previous prime is 217428919993. The next prime is 217428920017. The reversal of 217428920000 is 29824712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2677862 + ... + 2757861.

Almost surely, 2^217428920000 is an apocalyptic number.

217428920000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217428920000 is an abundant number, since it is smaller than the sum of its proper divisors (321724236388).

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

217428920000 is an frugal number, since it uses more digits than its factorization.

217428920000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5435755 (or 5435730 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 217428920000 in words is "two hundred seventeen billion, four hundred twenty-eight million, nine hundred twenty thousand".