111212121211012 has 6 divisors (see below), whose sum is σ = 194621212119278. Its totient is φ = 55606060605504.

The previous prime is 111212121210979. The next prime is 111212121211049. The reversal of 111212121211012 is 210112121212111.

It can be written as a sum of positive squares in only one way, i.e., 61709414425156 + 49502706785856 = 7855534^2 + 7035816^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13901515151373 + ... + 13901515151380.

Almost surely, 2^{111212121211012} is an apocalyptic number.

It is an amenable number.

111212121211012 is a deficient number, since it is larger than the sum of its proper divisors (83409090908266).

111212121211012 is a wasteful number, since it uses less digits than its factorization.

111212121211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27803030302757 (or 27803030302755 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111212121211012 its reverse (210112121212111), we get a palindrome (321324242423123).

The spelling of 111212121211012 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred eleven thousand, twelve".