121122221 has 8 divisors (see below), whose sum is σ = 134373600. Its totient is φ = 108244240.

The previous prime is 121122193. The next prime is 121122269. The reversal of 121122221 is 122221121.

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 121122221 - 2¹⁴ = 121105837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121122196 and 121122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121022221) 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, 92666 + ... + 93963.

It is an arithmetic number, because the mean of its divisors is an integer number (16796700).

Almost surely, 2^121122221 is an apocalyptic number.

121122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121122221 is a deficient number, since it is larger than the sum of its proper divisors (13251379).

121122221 is a wasteful number, since it uses less digits than its factorization.

121122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186699.

The product of its digits is 32, while the sum is 14.

The square root of 121122221 is about 11005.5540978181. The cubic root of 121122221 is about 494.7752215505.

Adding to 121122221 its reverse (122221121), we get a palindrome (243343342).

It can be divided in two parts, 1211 and 22221, that added together give a palindrome (23432).

The spelling of 121122221 in words is "one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".