2121031231 has 8 divisors (see below), whose sum is σ = 2449961424. Its totient is φ = 1814785920.

The previous prime is 2121031193. The next prime is 2121031247. The reversal of 2121031231 is 1321301212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121031231 - 2¹⁵ = 2120998463 is a prime.

It is a super-2 number, since 2×2121031231² = 8997546965754750722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121031271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5671020 + ... + 5671393.

It is an arithmetic number, because the mean of its divisors is an integer number (306245178).

Almost surely, 2^2121031231 is an apocalyptic number.

2121031231 is a deficient number, since it is larger than the sum of its proper divisors (328930193).

2121031231 is a wasteful number, since it uses less digits than its factorization.

2121031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11342441.

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

The square root of 2121031231 is about 46054.6548244583. The cubic root of 2121031231 is about 1284.8399182860.

Adding to 2121031231 its reverse (1321301212), we get a palindrome (3442332443).

It can be divided in two parts, 21210 and 31231, that added together give a square (52441 = 229²).

The spelling of 2121031231 in words is "two billion, one hundred twenty-one million, thirty-one thousand, two hundred thirty-one".