105121221 has 8 divisors (see below), whose sum is σ = 140566944. Its totient is φ = 69878160.

The previous prime is 105121189. The next prime is 105121229. The reversal of 105121221 is 122121501.

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

It is not a de Polignac number, because 105121221 - 2⁵ = 105121189 is a prime.

It is a super-2 number, since 2×105121221² = 22100942209061682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 105121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105121229) 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, 49450 + ... + 51531.

It is an arithmetic number, because the mean of its divisors is an integer number (17570868).

Almost surely, 2^105121221 is an apocalyptic number.

It is an amenable number.

105121221 is a deficient number, since it is larger than the sum of its proper divisors (35445723).

105121221 is a wasteful number, since it uses less digits than its factorization.

105121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101331.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 105121221 is about 10252.8640388918. The cubic root of 105121221 is about 471.9508785542.

Adding to 105121221 its reverse (122121501), we get a palindrome (227242722).

The spelling of 105121221 in words is "one hundred five million, one hundred twenty-one thousand, two hundred twenty-one".