121306644 has 36 divisors (see below), whose sum is σ = 310089780. Its totient is φ = 39980160.

The previous prime is 121306639. The next prime is 121306663. The reversal of 121306644 is 446603121.

121306644 is a `hidden beast` number, since 1 + 2 + 13 + 0 + 6 + 644 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 78535044 + 42771600 = 8862^2 + 6540^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15727 + ... + 22134.

It is an arithmetic number, because the mean of its divisors is an integer number (8613605).

Almost surely, 2^121306644 is an apocalyptic number.

It is an amenable number.

121306644 is an abundant number, since it is smaller than the sum of its proper divisors (188783136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121306644 is a wasteful number, since it uses less digits than its factorization.

121306644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37960 (or 37955 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 121306644 is about 11013.9295439911. The cubic root of 121306644 is about 495.0262122636.

Adding to 121306644 its reverse (446603121), we get a palindrome (567909765).

The spelling of 121306644 in words is "one hundred twenty-one million, three hundred six thousand, six hundred forty-four".