2121100011 has 12 divisors (see below), whose sum is σ = 3162644160. Its totient is φ = 1368451440.

The previous prime is 2121099983. The next prime is 2121100019. The reversal of 2121100011 is 1100011212.

It is a happy number.

It is not a de Polignac number, because 2121100011 - 2⁶ = 2121099947 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 = 2121099966 and 2121100002.

It is not an unprimeable number, because it can be changed into a prime (2121100019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3800976 + ... + 3801533.

It is an arithmetic number, because the mean of its divisors is an integer number (263553680).

Almost surely, 2^2121100011 is an apocalyptic number.

2121100011 is a deficient number, since it is larger than the sum of its proper divisors (1041544149).

2121100011 is a wasteful number, since it uses less digits than its factorization.

2121100011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7602546 (or 7602543 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2121100011 is about 46055.4015398845. The cubic root of 2121100011 is about 1284.8538062371.

Adding to 2121100011 its reverse (1100011212), we get a palindrome (3221111223).

It can be divided in two parts, 212 and 1100011, that multiplied together give a palindrome (233202332).

The spelling of 2121100011 in words is "two billion, one hundred twenty-one million, one hundred thousand, eleven".