2131212223 has 12 divisors (see below), whose sum is σ = 2586956400. Its totient is φ = 1747328352.

The previous prime is 2131212217. The next prime is 2131212229. The reversal of 2131212223 is 3222121312.

It is an interprime number because it is at equal distance from previous prime (2131212217) and next prime (2131212229).

It is not a de Polignac number, because 2131212223 - 2¹⁷ = 2131081151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2131212223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131212229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 944398 + ... + 946651.

It is an arithmetic number, because the mean of its divisors is an integer number (215579700).

Almost surely, 2^2131212223 is an apocalyptic number.

2131212223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2131212223 is a deficient number, since it is larger than the sum of its proper divisors (455744177).

2131212223 is a wasteful number, since it uses less digits than its factorization.

2131212223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891086 (or 1891079 counting only the distinct ones).

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

The square root of 2131212223 is about 46165.0541318864. The cubic root of 2131212223 is about 1286.8923901802.

Adding to 2131212223 its reverse (3222121312), we get a palindrome (5353333535).

The spelling of 2131212223 in words is "two billion, one hundred thirty-one million, two hundred twelve thousand, two hundred twenty-three".