2121001011 has 16 divisors (see below), whose sum is σ = 3201513120.
Its totient is φ = 1387320480.
The previous prime is 2121000991. The next prime is 2121001019. The reversal of 2121001011 is 1101001212.
It is a happy number.
It is not a de Polignac number, because 2121001011 - 211 = 2120998963 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 2121000984 and 2121001002.
It is not an unprimeable number, because it can be changed into a prime (2121001019) 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 15 ways as a sum of consecutive naturals, for example, 739660 + ... + 742521.
It is an arithmetic number, because the mean of its divisors is an integer number (200094570).
Almost surely, 22121001011 is an apocalyptic number.
2121001011 is a deficient number, since it is larger than the sum of its proper divisors (1080512109).
2121001011 is a wasteful number, since it uses less digits than its factorization.
2121001011 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1482243 (or 1482237 counting only the distinct ones).
The product of its (nonzero) digits is 4, while the sum is 9.
The square root of 2121001011 is about 46054.3267348465.
The cubic root of 2121001011 is about 1284.8338162154.
Adding to 2121001011 its reverse (1101001212), we get a palindrome (3222002223).
The spelling of 2121001011 in words is "two billion, one hundred twenty-one million, one thousand, eleven".