2121403231 has 4 divisors (see below), whose sum is σ = 2123879472. Its totient is φ = 2118926992.

The previous prime is 2121403211. The next prime is 2121403261. The reversal of 2121403231 is 1323041212.

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 2121403231 - 2⁹ = 2121402719 is a prime.

It is a super-2 number, since 2×2121403231² = 9000703336994478722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121403199 and 2121403208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121403211) 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, 1236835 + ... + 1238548.

It is an arithmetic number, because the mean of its divisors is an integer number (530969868).

Almost surely, 2^2121403231 is an apocalyptic number.

2121403231 is a deficient number, since it is larger than the sum of its proper divisors (2476241).

2121403231 is an equidigital number, since it uses as much as digits as its factorization.

2121403231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476240.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2121403231 is about 46058.6933271017. The cubic root of 2121403231 is about 1284.9150283712.

Adding to 2121403231 its reverse (1323041212), we get a palindrome (3444444443).

The spelling of 2121403231 in words is "two billion, one hundred twenty-one million, four hundred three thousand, two hundred thirty-one".