2123212331 has 4 divisors (see below), whose sum is σ = 2248107192. Its totient is φ = 1998317472.

The previous prime is 2123212319. The next prime is 2123212337. The reversal of 2123212331 is 1332123212.

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 2123212331 - 2¹⁸ = 2122950187 is a prime.

It is a super-2 number, since 2×2123212331² = 9016061205020907122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123212337) 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, 62447405 + ... + 62447438.

It is an arithmetic number, because the mean of its divisors is an integer number (562026798).

Almost surely, 2^2123212331 is an apocalyptic number.

2123212331 is a deficient number, since it is larger than the sum of its proper divisors (124894861).

2123212331 is a wasteful number, since it uses less digits than its factorization.

2123212331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124894860.

The product of its digits is 432, while the sum is 20.

The square root of 2123212331 is about 46078.3282140314. The cubic root of 2123212331 is about 1285.2801765083.

Adding to 2123212331 its reverse (1332123212), we get a palindrome (3455335543).

The spelling of 2123212331 in words is "two billion, one hundred twenty-three million, two hundred twelve thousand, three hundred thirty-one".