667210232121 has 32 divisors (see below), whose sum is σ = 983029747968.
Its totient is φ = 400386201600.
The previous prime is 667210232119. The next prime is 667210232131. The reversal of 667210232121 is 121232012766.
It is not a de Polignac number, because 667210232121 - 21 = 667210232119 is a prime.
It is not an unprimeable number, because it can be changed into a prime (667210232111) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9792271 + ... + 9860171.
It is an arithmetic number, because the mean of its divisors is an integer number (30719679624).
Almost surely, 2667210232121 is an apocalyptic number.
It is an amenable number.
667210232121 is a deficient number, since it is larger than the sum of its proper divisors (315819515847).
667210232121 is a wasteful number, since it uses less digits than its factorization.
667210232121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 76321.
The product of its (nonzero) digits is 12096, while the sum is 33.
Adding to 667210232121 its reverse (121232012766), we get a palindrome (788442244887).
The spelling of 667210232121 in words is "six hundred sixty-seven billion, two hundred ten million, two hundred thirty-two thousand, one hundred twenty-one".