121336640 has 28 divisors (see below), whose sum is σ = 288933636. Its totient is φ = 48534528.

The previous prime is 121336619. The next prime is 121336651. The reversal of 121336640 is 46633121.

It can be written as a sum of positive squares in 2 ways, for example, as 58736896 + 62599744 = 7664^2 + 7912^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189269 + ... + 189908.

Almost surely, 2^121336640 is an apocalyptic number.

121336640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121336640 is an abundant number, since it is smaller than the sum of its proper divisors (167596996).

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

121336640 is an equidigital number, since it uses as much as digits as its factorization.

121336640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379194 (or 379184 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 121336640 is about 11015.2911899777. The cubic root of 121336640 is about 495.0670112999.

Adding to 121336640 its reverse (46633121), we get a palindrome (167969761).

The spelling of 121336640 in words is "one hundred twenty-one million, three hundred thirty-six thousand, six hundred forty".