111012121221 has 8 divisors (see below), whose sum is σ = 148017710400. Its totient is φ = 74007306432.

The previous prime is 111012121217. The next prime is 111012121223. The reversal of 111012121221 is 122121210111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111012121221 - 2² = 111012121217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111012121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111012121223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407680 + ... + 623078.

It is an arithmetic number, because the mean of its divisors is an integer number (18502213800).

Almost surely, 2^111012121221 is an apocalyptic number.

It is an amenable number.

111012121221 is a deficient number, since it is larger than the sum of its proper divisors (37005589179).

111012121221 is a wasteful number, since it uses less digits than its factorization.

111012121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387195.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111012121221 its reverse (122121210111), we get a palindrome (233133331332).

The spelling of 111012121221 in words is "one hundred eleven billion, twelve million, one hundred twenty-one thousand, two hundred twenty-one".