2121201331 has 4 divisors (see below), whose sum is σ = 2121472600. Its totient is φ = 2120930064.

The previous prime is 2121201323. The next prime is 2121201337. The reversal of 2121201331 is 1331021212.

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 2121201331 - 2³ = 2121201323 is a prime.

It is a super-2 number, since 2×2121201331² = 8998990173272343122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121201337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123546 + ... + 139663.

It is an arithmetic number, because the mean of its divisors is an integer number (530368150).

Almost surely, 2^2121201331 is an apocalyptic number.

2121201331 is a deficient number, since it is larger than the sum of its proper divisors (271269).

2121201331 is an equidigital number, since it uses as much as digits as its factorization.

2121201331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271268.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2121201331 is about 46056.5015063020. The cubic root of 2121201331 is about 1284.8742640678.

Adding to 2121201331 its reverse (1331021212), we get a palindrome (3452222543).

The spelling of 2121201331 in words is "two billion, one hundred twenty-one million, two hundred one thousand, three hundred thirty-one".