2001122122 has 24 divisors (see below), whose sum is σ = 3195442656. Its totient is φ = 939695808.
The previous prime is 2001122117. The next prime is 2001122143. The reversal of 2001122122 is 2212211002.
It is a happy number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 287293 + ... + 294175.
It is an arithmetic number, because the mean of its divisors is an integer number (133143444).
Almost surely, 22001122122 is an apocalyptic number.
2001122122 is a deficient number, since it is larger than the sum of its proper divisors (1194320534).
2001122122 is a wasteful number, since it uses less digits than its factorization.
2001122122 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7422 (or 7405 counting only the distinct ones).
The product of its (nonzero) digits is 32, while the sum is 13.
The square root of 2001122122 is about 44733.9034961180. The cubic root of 2001122122 is about 1260.1566366956.
Adding to 2001122122 its reverse (2212211002), we get a palindrome (4213333124).
The spelling of 2001122122 in words is "two billion, one million, one hundred twenty-two thousand, one hundred twenty-two".
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