121005644 has 6 divisors (see below), whose sum is σ = 211759884. Its totient is φ = 60502820.

The previous prime is 121005641. The next prime is 121005653. The reversal of 121005644 is 446500121.

It is not an unprimeable number, because it can be changed into a prime (121005641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15125702 + ... + 15125709.

It is an arithmetic number, because the mean of its divisors is an integer number (35293314).

Almost surely, 2^121005644 is an apocalyptic number.

It is an amenable number.

121005644 is a deficient number, since it is larger than the sum of its proper divisors (90754240).

121005644 is a wasteful number, since it uses less digits than its factorization.

121005644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30251415 (or 30251413 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 121005644 is about 11000.2565424630. The cubic root of 121005644 is about 494.6164344856.

Adding to 121005644 its reverse (446500121), we get a palindrome (567505765).

The spelling of 121005644 in words is "one hundred twenty-one million, five thousand, six hundred forty-four".