121603421856 has 96 divisors (see below), whose sum is σ = 372572282880. Its totient is φ = 34004595456.

The previous prime is 121603421833. The next prime is 121603421861. The reversal of 121603421856 is 658124306121.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1893496 + ... + 1956663.

It is an arithmetic number, because the mean of its divisors is an integer number (3880961280).

Almost surely, 2^121603421856 is an apocalyptic number.

121603421856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121603421856 is an abundant number, since it is smaller than the sum of its proper divisors (250968861024).

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

121603421856 is a wasteful number, since it uses less digits than its factorization.

121603421856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3850226 (or 3850218 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

Adding to 121603421856 its reverse (658124306121), we get a palindrome (779727727977).

The spelling of 121603421856 in words is "one hundred twenty-one billion, six hundred three million, four hundred twenty-one thousand, eight hundred fifty-six".