212103131 has 4 divisors (see below), whose sum is σ = 214203264. Its totient is φ = 210003000.

The previous prime is 212103121. The next prime is 212103149. The reversal of 212103131 is 131301212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212103131 is a prime.

It is a super-2 number, since 2×212103131² = 89975476360006322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212103121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049915 + ... + 1050116.

It is an arithmetic number, because the mean of its divisors is an integer number (53550816).

Almost surely, 2^212103131 is an apocalyptic number.

212103131 is a deficient number, since it is larger than the sum of its proper divisors (2100133).

212103131 is a wasteful number, since it uses less digits than its factorization.

212103131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100132.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 212103131 is about 14563.7608810362. The cubic root of 212103131 is about 596.3698691738.

Adding to 212103131 its reverse (131301212), we get a palindrome (343404343).

The spelling of 212103131 in words is "two hundred twelve million, one hundred three thousand, one hundred thirty-one".