111212001 has 16 divisors (see below), whose sum is σ = 166221120. Its totient is φ = 73483200.

The previous prime is 111211999. The next prime is 111212021. The reversal of 111212001 is 100212111.

It is a happy number.

It is not a de Polignac number, because 111212001 - 2¹ = 111211999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (111212021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15175 + ... + 21276.

It is an arithmetic number, because the mean of its divisors is an integer number (10388820).

Almost surely, 2^111212001 is an apocalyptic number.

It is an amenable number.

111212001 is a deficient number, since it is larger than the sum of its proper divisors (55009119).

111212001 is a wasteful number, since it uses less digits than its factorization.

111212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36573 (or 36567 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 111212001 is about 10545.7100756658. The cubic root of 111212001 is about 480.8953211493.

Adding to 111212001 its reverse (100212111), we get a palindrome (211424112).

The spelling of 111212001 in words is "one hundred eleven million, two hundred twelve thousand, one".