121644200500 has 24 divisors (see below), whose sum is σ = 265670934984. Its totient is φ = 48657680000.

The previous prime is 121644200467. The next prime is 121644200501. The reversal of 121644200500 is 5002446121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1167178896 + 120477021604 = 34164^2 + 347098^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121644200501) 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 7 ways as a sum of consecutive naturals, for example, 121643701 + ... + 121644700.

It is an arithmetic number, because the mean of its divisors is an integer number (11069622291).

Almost surely, 2^121644200500 is an apocalyptic number.

121644200500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121644200500 is an abundant number, since it is smaller than the sum of its proper divisors (144026734484).

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

121644200500 is a wasteful number, since it uses less digits than its factorization.

121644200500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243288420 (or 243288408 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 121644200500 its reverse (5002446121), we get a palindrome (126646646621).

The spelling of 121644200500 in words is "one hundred twenty-one billion, six hundred forty-four million, two hundred thousand, five hundred".