217740942970 has 32 divisors (see below), whose sum is σ = 416346796800. Its totient is φ = 81755355456.

The previous prime is 217740942949. The next prime is 217740942977. The reversal of 217740942970 is 79249047712.

It is a super-2 number, since 2×217740942970² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (217740942977) 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, 5236194 + ... + 5277613.

It is an arithmetic number, because the mean of its divisors is an integer number (13010837400).

Almost surely, 2^217740942970 is an apocalyptic number.

217740942970 is a deficient number, since it is larger than the sum of its proper divisors (198605853830).

217740942970 is a wasteful number, since it uses less digits than its factorization.

217740942970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10513942.

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 217740942970 in words is "two hundred seventeen billion, seven hundred forty million, nine hundred forty-two thousand, nine hundred seventy".