31212122221211 has 16 divisors (see below), whose sum is σ = 33126321816000. Its totient is φ = 29306692819968.

The previous prime is 31212122221127. The next prime is 31212122221229. The reversal of 31212122221211 is 11212222121213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212122221211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212122221271) 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 15 ways as a sum of consecutive naturals, for example, 10883615 + ... + 13449063.

It is an arithmetic number, because the mean of its divisors is an integer number (2070395113500).

Almost surely, 2^{31212122221211} is an apocalyptic number.

31212122221211 is a deficient number, since it is larger than the sum of its proper divisors (1914199594789).

31212122221211 is a wasteful number, since it uses less digits than its factorization.

31212122221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567158.

The product of its digits is 384, while the sum is 23.

Adding to 31212122221211 its reverse (11212222121213), we get a palindrome (42424344342424).

The spelling of 31212122221211 in words is "thirty-one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred eleven".