121102221 has 32 divisors (see below), whose sum is σ = 171601920. Its totient is φ = 75871296.

The previous prime is 121102171. The next prime is 121102243. The reversal of 121102221 is 122201121.

It is not a de Polignac number, because 121102221 - 2¹⁵ = 121069453 is a prime.

It is a super-2 number, since 2×121102221² = 29331495862265682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121102197 and 121102206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121102021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 725080 + ... + 725246.

It is an arithmetic number, because the mean of its divisors is an integer number (5362560).

Almost surely, 2^121102221 is an apocalyptic number.

It is an amenable number.

121102221 is a deficient number, since it is larger than the sum of its proper divisors (50499699).

121102221 is a wasteful number, since it uses less digits than its factorization.

121102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 121102221 is about 11004.6454281817. The cubic root of 121102221 is about 494.7479872163.

Adding to 121102221 its reverse (122201121), we get a palindrome (243303342).

The spelling of 121102221 in words is "one hundred twenty-one million, one hundred two thousand, two hundred twenty-one".