31212103100211 has 36 divisors (see below), whose sum is σ = 49609942256056. Its totient is φ = 18895569485760.

The previous prime is 31212103100209. The next prime is 31212103100237. The reversal of 31212103100211 is 11200130121213.

31212103100211 is a `hidden beast` number, since 3 + 121 + 21 + 0 + 310 + 0 + 211 = 666.

It is not a de Polignac number, because 31212103100211 - 2¹ = 31212103100209 is a prime.

It is a super-2 number, since 2×31212103100211² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212103100411) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14812306 + ... + 16787751.

Almost surely, 2^{31212103100211} is an apocalyptic number.

31212103100211 is a deficient number, since it is larger than the sum of its proper divisors (18397839155845).

31212103100211 is a wasteful number, since it uses less digits than its factorization.

31212103100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31600992 (or 31600978 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 31212103100211 its reverse (11200130121213), we get a palindrome (42412233221424).

The spelling of 31212103100211 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, one hundred thousand, two hundred eleven".