2131213031 has 4 divisors (see below), whose sum is σ = 2135400600. Its totient is φ = 2127025464.

The previous prime is 2131213013. The next prime is 2131213043. The reversal of 2131213031 is 1303121312.

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 2131213031 - 2¹⁴ = 2131196647 is a prime.

It is a super-2 number, since 2×2131213031² = 9084137967008413922, 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 (2131213631) 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, 2093021 + ... + 2094038.

It is an arithmetic number, because the mean of its divisors is an integer number (533850150).

Almost surely, 2^2131213031 is an apocalyptic number.

2131213031 is a deficient number, since it is larger than the sum of its proper divisors (4187569).

2131213031 is an equidigital number, since it uses as much as digits as its factorization.

2131213031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4187568.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2131213031 is about 46165.0628830937. The cubic root of 2131213031 is about 1286.8925528121.

Adding to 2131213031 its reverse (1303121312), we get a palindrome (3434334343).

It can be divided in two parts, 21312 and 13031, that added together give a palindrome (34343).

The spelling of 2131213031 in words is "two billion, one hundred thirty-one million, two hundred thirteen thousand, thirty-one".