111212121212101 has 96 divisors (see below), whose sum is σ = 146175598080000. Its totient is φ = 82613368191744.

The previous prime is 111212121212089. The next prime is 111212121212131. The reversal of 111212121212101 is 101212121212111.

It is not a de Polignac number, because 111212121212101 - 2¹⁷ = 111212121081029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212121212131) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1483601860 + ... + 1483676818.

It is an arithmetic number, because the mean of its divisors is an integer number (1522662480000).

Almost surely, 2^{111212121212101} is an apocalyptic number.

It is an amenable number.

111212121212101 is a deficient number, since it is larger than the sum of its proper divisors (34963476867899).

111212121212101 is a wasteful number, since it uses less digits than its factorization.

111212121212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75603 (or 75590 counting only the distinct ones).

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

Adding to 111212121212101 its reverse (101212121212111), we get a palindrome (212424242424212).

The spelling of 111212121212101 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, one hundred one".