2121010011 has 6 divisors (see below), whose sum is σ = 3063681140. Its totient is φ = 1414006668.

The previous prime is 2121010009. The next prime is 2121010013. The reversal of 2121010011 is 1100101212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2121010009) and next prime (2121010013).

It is not a de Polignac number, because 2121010011 - 2¹ = 2121010009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 235667779 = 2121010011 / (2 + 1 + 2 + 1 + 0 + 1 + 0 + 0 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121009975 and 2121010002.

It is not an unprimeable number, because it can be changed into a prime (2121010013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117833881 + ... + 117833898.

Almost surely, 2^2121010011 is an apocalyptic number.

2121010011 is a deficient number, since it is larger than the sum of its proper divisors (942671129).

2121010011 is a wasteful number, since it uses less digits than its factorization.

2121010011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235667785 (or 235667782 counting only the distinct ones).

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

The square root of 2121010011 is about 46054.4244454320. The cubic root of 2121010011 is about 1284.8356335158.

Adding to 2121010011 its reverse (1100101212), we get a palindrome (3221111223).

The spelling of 2121010011 in words is "two billion, one hundred twenty-one million, ten thousand, eleven".