2001221102122 has 32 divisors (see below), whose sum is σ = 3281024387520.
Its totient is φ = 907896789120.
The previous prime is 2001221102117. The next prime is 2001221102141. The reversal of 2001221102122 is 2212011221002.
It is a happy number.
It is a junction number, because it is equal to n+sod(n) for n = 2001221102096 and 2001221102105.
It is an unprimeable number.
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 15 ways as a sum of consecutive naturals, for example, 116321173 + ... + 116338375.
It is an arithmetic number, because the mean of its divisors is an integer number (102532012110).
Almost surely, 22001221102122 is an apocalyptic number.
2001221102122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.
2001221102122 is a deficient number, since it is larger than the sum of its proper divisors (1279803285398).
2001221102122 is a wasteful number, since it uses less digits than its factorization.
2001221102122 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 27078.
The product of its (nonzero) digits is 64, while the sum is 16.
Adding to 2001221102122 its reverse (2212011221002), we get a palindrome (4213232323124).
The spelling of 2001221102122 in words is "two trillion, one billion, two hundred twenty-one million, one hundred two thousand, one hundred twenty-two".