2101211331 has 4 divisors (see below), whose sum is σ = 2801615112. Its totient is φ = 1400807552.

The previous prime is 2101211303. The next prime is 2101211347. The reversal of 2101211331 is 1331121012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2101211331 - 2⁶ = 2101211267 is a prime.

It is a super-2 number, since 2×2101211331² = 8830178115045583122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2101211331.

It is not an unprimeable number, because it can be changed into a prime (2101211531) 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 3 ways as a sum of consecutive naturals, for example, 350201886 + ... + 350201891.

It is an arithmetic number, because the mean of its divisors is an integer number (700403778).

Almost surely, 2^2101211331 is an apocalyptic number.

2101211331 is a deficient number, since it is larger than the sum of its proper divisors (700403781).

2101211331 is an equidigital number, since it uses as much as digits as its factorization.

2101211331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700403780.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 2101211331 is about 45838.9717489387. The cubic root of 2101211331 is about 1280.8253407142.

Adding to 2101211331 its reverse (1331121012), we get a palindrome (3432332343).

The spelling of 2101211331 in words is "two billion, one hundred one million, two hundred eleven thousand, three hundred thirty-one".