2209121331 has 4 divisors (see below), whose sum is σ = 2945495112. Its totient is φ = 1472747552.

The previous prime is 2209121309. The next prime is 2209121333. The reversal of 2209121331 is 1331219022.

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 2209121331 - 2¹⁹ = 2208597043 is a prime.

It is a super-2 number, since 2×2209121331² = 9760434110158423122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2209121333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368186886 + ... + 368186891.

It is an arithmetic number, because the mean of its divisors is an integer number (736373778).

Almost surely, 2^2209121331 is an apocalyptic number.

2209121331 is a deficient number, since it is larger than the sum of its proper divisors (736373781).

2209121331 is an equidigital number, since it uses as much as digits as its factorization.

2209121331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736373780.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 2209121331 is about 47001.2907375957. The cubic root of 2209121331 is about 1302.3864116496.

The spelling of 2209121331 in words is "two billion, two hundred nine million, one hundred twenty-one thousand, three hundred thirty-one".