121641784 has 48 divisors (see below), whose sum is σ = 255535560. Its totient is φ = 54225600.

The previous prime is 121641769. The next prime is 121641803. The reversal of 121641784 is 487146121.

It is a happy number.

It is a super-2 number, since 2×121641784² = 29593447229405312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50119 + ... + 52489.

Almost surely, 2^121641784 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 121641784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127767780).

121641784 is an abundant number, since it is smaller than the sum of its proper divisors (133893776).

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

121641784 is a wasteful number, since it uses less digits than its factorization.

121641784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452 (or 2437 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 121641784 is about 11029.1334201740. The cubic root of 121641784 is about 495.4816710646.

The spelling of 121641784 in words is "one hundred twenty-one million, six hundred forty-one thousand, seven hundred eighty-four".