121641378 has 16 divisors (see below), whose sum is σ = 244329696. Its totient is φ = 40372640.

The previous prime is 121641361. The next prime is 121641407. The reversal of 121641378 is 873146121.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42108 + ... + 44903.

It is an arithmetic number, because the mean of its divisors is an integer number (15270606).

Almost surely, 2^121641378 is an apocalyptic number.

121641378 is an abundant number, since it is smaller than the sum of its proper divisors (122688318).

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

121641378 is a wasteful number, since it uses less digits than its factorization.

121641378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87249.

The product of its digits is 8064, while the sum is 33.

The square root of 121641378 is about 11029.1150143609. The cubic root of 121641378 is about 495.4811198128.

Adding to 121641378 its reverse (873146121), we get a palindrome (994787499).

The spelling of 121641378 in words is "one hundred twenty-one million, six hundred forty-one thousand, three hundred seventy-eight".