121005445 has 12 divisors (see below), whose sum is σ = 159607980. Its totient is φ = 88003520.

The previous prime is 121005421. The next prime is 121005449. The reversal of 121005445 is 544500121.

It can be written as a sum of positive squares in 2 ways, for example, as 23213124 + 97792321 = 4818^2 + 9889^2 .

It is not a de Polignac number, because 121005445 - 2⁷ = 121005317 is a prime.

121005445 is a modest number, since divided by 5445 gives 1210 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121005449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99400 + ... + 100609.

It is an arithmetic number, because the mean of its divisors is an integer number (13300665).

Almost surely, 2^121005445 is an apocalyptic number.

It is an amenable number.

121005445 is a deficient number, since it is larger than the sum of its proper divisors (38602535).

121005445 is a wasteful number, since it uses less digits than its factorization.

121005445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200036 (or 200025 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 121005445 is about 11000.2474972157. The cubic root of 121005445 is about 494.6161633448.

Adding to 121005445 its reverse (544500121), we get a palindrome (665505566).

The spelling of 121005445 in words is "one hundred twenty-one million, five thousand, four hundred forty-five".