121005388 has 24 divisors (see below), whose sum is σ = 256247712. Its totient is φ = 48808704.

The previous prime is 121005383. The next prime is 121005407. The reversal of 121005388 is 883500121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (121005383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126631 + ... + 127582.

It is an arithmetic number, because the mean of its divisors is an integer number (10676988).

Almost surely, 2^121005388 is an apocalyptic number.

It is an amenable number.

121005388 is an abundant number, since it is smaller than the sum of its proper divisors (135242324).

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

121005388 is a wasteful number, since it uses less digits than its factorization.

121005388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254241 (or 254239 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 121005388 is about 11000.2449063646. The cubic root of 121005388 is about 494.6160856812.

The spelling of 121005388 in words is "one hundred twenty-one million, five thousand, three hundred eighty-eight".