111212202021212 has 12 divisors (see below), whose sum is σ = 194622435445200. Its totient is φ = 55605791894016.

The previous prime is 111212202021031. The next prime is 111212202021241. The reversal of 111212202021212 is 212120202212111.

It is a super-4 number, since 4×111212202021212⁴ (a number of 57 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76468712 + ... + 77909487.

It is an arithmetic number, because the mean of its divisors is an integer number (16218536287100).

Almost surely, 2^{111212202021212} is an apocalyptic number.

It is an amenable number.

111212202021212 is a deficient number, since it is larger than the sum of its proper divisors (83410233423988).

111212202021212 is a wasteful number, since it uses less digits than its factorization.

111212202021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154558300 (or 154558298 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111212202021212 its reverse (212120202212111), we get a palindrome (323332404233323).

The spelling of 111212202021212 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred two million, twenty-one thousand, two hundred twelve".