217406394472 has 16 divisors (see below), whose sum is σ = 407727502560. Its totient is φ = 108679060464.

The previous prime is 217406394461. The next prime is 217406394473. The reversal of 217406394472 is 274493604712.

It is not an unprimeable number, because it can be changed into a prime (217406394473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2978788 + ... + 3050899.

It is an arithmetic number, because the mean of its divisors is an integer number (25482968910).

Almost surely, 2^217406394472 is an apocalyptic number.

It is an amenable number.

217406394472 is a deficient number, since it is larger than the sum of its proper divisors (190321108088).

217406394472 is a wasteful number, since it uses less digits than its factorization.

217406394472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6034200 (or 6034196 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 49.

The spelling of 217406394472 in words is "two hundred seventeen billion, four hundred six million, three hundred ninety-four thousand, four hundred seventy-two".