217022380 has 24 divisors (see below), whose sum is σ = 462552048. Its totient is φ = 85512768.

The previous prime is 217022347. The next prime is 217022461. The reversal of 217022380 is 83220712.

217022380 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 79639 + ... + 82318.

It is an arithmetic number, because the mean of its divisors is an integer number (19273002).

Almost surely, 2^217022380 is an apocalyptic number.

217022380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217022380 is an abundant number, since it is smaller than the sum of its proper divisors (245529668).

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

217022380 is a wasteful number, since it uses less digits than its factorization.

217022380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162033 (or 162031 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 217022380 is about 14731.6794697685. The cubic root of 217022380 is about 600.9451584921.

The spelling of 217022380 in words is "two hundred seventeen million, twenty-two thousand, three hundred eighty".