121620644 has 6 divisors (see below), whose sum is σ = 212836134. Its totient is φ = 60810320.

The previous prime is 121620643. The next prime is 121620673. The reversal of 121620644 is 446026121.

It can be written as a sum of positive squares in only one way, i.e., 92891044 + 28729600 = 9638^2 + 5360^2 .

It is not an unprimeable number, because it can be changed into a prime (121620643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15202577 + ... + 15202584.

It is an arithmetic number, because the mean of its divisors is an integer number (35472689).

Almost surely, 2^121620644 is an apocalyptic number.

It is an amenable number.

121620644 is a deficient number, since it is larger than the sum of its proper divisors (91215490).

121620644 is a wasteful number, since it uses less digits than its factorization.

121620644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30405165 (or 30405163 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 121620644 is about 11028.1750076792. The cubic root of 121620644 is about 495.4529663191.

Adding to 121620644 its reverse (446026121), we get a palindrome (567646765).

The spelling of 121620644 in words is "one hundred twenty-one million, six hundred twenty thousand, six hundred forty-four".