121445136 has 80 divisors (see below), whose sum is σ = 353459520. Its totient is φ = 39916800.

The previous prime is 121445119. The next prime is 121445141. The reversal of 121445136 is 631544121.

It is a happy number.

121445136 is a `hidden beast` number, since 1 + 2 + 144 + 513 + 6 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29611 + ... + 33461.

It is an arithmetic number, because the mean of its divisors is an integer number (4418244).

Almost surely, 2^121445136 is an apocalyptic number.

121445136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121445136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176729760).

121445136 is an abundant number, since it is smaller than the sum of its proper divisors (232014384).

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

121445136 is a wasteful number, since it uses less digits than its factorization.

121445136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941 (or 3929 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 121445136 is about 11020.2148799377. The cubic root of 121445136 is about 495.2145259305.

Adding to 121445136 its reverse (631544121), we get a palindrome (752989257).

The spelling of 121445136 in words is "one hundred twenty-one million, four hundred forty-five thousand, one hundred thirty-six".