217322040 has 64 divisors (see below), whose sum is σ = 702122400. Its totient is φ = 53494272.

The previous prime is 217322023. The next prime is 217322041. The reversal of 217322040 is 40223712.

It is a junction number, because it is equal to n+sod(n) for n = 217321998 and 217322016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217322041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68095 + ... + 71214.

Almost surely, 2^217322040 is an apocalyptic number.

217322040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217322040 is an abundant number, since it is smaller than the sum of its proper divisors (484800360).

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

217322040 is a wasteful number, since it uses less digits than its factorization.

217322040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139336 (or 139332 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 217322040 is about 14741.8465600480. The cubic root of 217322040 is about 601.2216221552.

Adding to 217322040 its reverse (40223712), we get a palindrome (257545752).

The spelling of 217322040 in words is "two hundred seventeen million, three hundred twenty-two thousand, forty".