121207644 has 96 divisors (see below), whose sum is σ = 332666880. Its totient is φ = 38102400.

The previous prime is 121207643. The next prime is 121207693. The reversal of 121207644 is 446702121.

121207644 is a `hidden beast` number, since 1 + 2 + 12 + 0 + 7 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121207643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136827 + ... + 137709.

It is an arithmetic number, because the mean of its divisors is an integer number (3465280).

Almost surely, 2^121207644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121207644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166333440).

121207644 is an abundant number, since it is smaller than the sum of its proper divisors (211459236).

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

121207644 is a wasteful number, since it uses less digits than its factorization.

With its successor (121207645) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (960).

121207644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968 (or 960 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 121207644 is about 11009.4343178930. The cubic root of 121207644 is about 494.8915097407.

Adding to 121207644 its reverse (446702121), we get a palindrome (567909765).

The spelling of 121207644 in words is "one hundred twenty-one million, two hundred seven thousand, six hundred forty-four".