212103312131 has 4 divisors (see below), whose sum is σ = 212303222064. Its totient is φ = 211903402200.

The previous prime is 212103312023. The next prime is 212103312133. The reversal of 212103312131 is 131213301212.

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 212103312131 - 2¹⁸ = 212103049987 is a prime.

It is a super-2 number, since 2×212103312131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212103312133) 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, 99953375 + ... + 99955496.

It is an arithmetic number, because the mean of its divisors is an integer number (53075805516).

Almost surely, 2^212103312131 is an apocalyptic number.

212103312131 is a deficient number, since it is larger than the sum of its proper divisors (199909933).

212103312131 is a wasteful number, since it uses less digits than its factorization.

212103312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199909932.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 212103312131 its reverse (131213301212), we get a palindrome (343316613343).

The spelling of 212103312131 in words is "two hundred twelve billion, one hundred three million, three hundred twelve thousand, one hundred thirty-one".