217142061 has 8 divisors (see below), whose sum is σ = 292179360.
Its totient is φ = 143433072.
The previous prime is 217142039. The next prime is 217142087. The reversal of 217142061 is 160241712.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 217142061 - 26 = 217141997 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (217141061) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331695 + ... + 332348.
It is an arithmetic number, because the mean of its divisors is an integer number (36522420).
Almost surely, 2217142061 is an apocalyptic number.
It is an amenable number.
217142061 is a deficient number, since it is larger than the sum of its proper divisors (75037299).
217142061 is a wasteful number, since it uses less digits than its factorization.
217142061 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 664155.
The product of its (nonzero) digits is 672, while the sum is 24.
The square root of 217142061 is about 14735.7409382766.
The cubic root of 217142061 is about 601.0556056277.
Adding to 217142061 its reverse (160241712), we get a palindrome (377383773).
The spelling of 217142061 in words is "two hundred seventeen million, one hundred forty-two thousand, sixty-one".