217538420224 has 20 divisors (see below), whose sum is σ = 434651961744. Its totient is φ = 108769209856.

The previous prime is 217538420159. The next prime is 217538420249. The reversal of 217538420224 is 422024835712.

It is a super-2 number, since 2×217538420224² (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 as a sum of consecutive naturals, namely, 212439352 + ... + 212440375.

Almost surely, 2^217538420224 is an apocalyptic number.

It is an amenable number.

217538420224 is a deficient number, since it is larger than the sum of its proper divisors (217113541520).

217538420224 is an frugal number, since it uses more digits than its factorization.

217538420224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424879745 (or 424879729 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 40.

The spelling of 217538420224 in words is "two hundred seventeen billion, five hundred thirty-eight million, four hundred twenty thousand, two hundred twenty-four".