121601403 has 48 divisors (see below), whose sum is σ = 220237056. Its totient is φ = 62809920.

The previous prime is 121601401. The next prime is 121601407. The reversal of 121601403 is 304106121.

It is a happy number.

121601403 is a `hidden beast` number, since 1 + 21 + 601 + 40 + 3 = 666.

It is not a de Polignac number, because 121601403 - 2¹ = 121601401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121601401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156925 + ... + 157697.

It is an arithmetic number, because the mean of its divisors is an integer number (4588272).

Almost surely, 2^121601403 is an apocalyptic number.

121601403 is a deficient number, since it is larger than the sum of its proper divisors (98635653).

121601403 is a wasteful number, since it uses less digits than its factorization.

121601403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024 (or 1021 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 121601403 is about 11027.3026166874. The cubic root of 121601403 is about 495.4268372208.

Adding to 121601403 its reverse (304106121), we get a palindrome (425707524).

The spelling of 121601403 in words is "one hundred twenty-one million, six hundred one thousand, four hundred three".