111121001221 has 8 divisors (see below), whose sum is σ = 111200335488. Its totient is φ = 111041700000.

The previous prime is 111121001207. The next prime is 111121001249. The reversal of 111121001221 is 122100121111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 111121001221 - 2²³ = 111112612613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121001021) 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, 12020161 + ... + 12029401.

It is an arithmetic number, because the mean of its divisors is an integer number (13900041936).

Almost surely, 2^111121001221 is an apocalyptic number.

It is an amenable number.

111121001221 is a deficient number, since it is larger than the sum of its proper divisors (79334267).

111121001221 is an equidigital number, since it uses as much as digits as its factorization.

111121001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16523.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111121001221 its reverse (122100121111), we get a palindrome (233221122332).

The spelling of 111121001221 in words is "one hundred eleven billion, one hundred twenty-one million, one thousand, two hundred twenty-one".