121586490550 has 36 divisors (see below), whose sum is σ = 263073469140. Its totient is φ = 41686795920.

The previous prime is 121586490521. The next prime is 121586490569. The reversal of 121586490550 is 55094685121.

It is a self number, because there is not a number n which added to its sum of digits gives 121586490550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24811120 + ... + 24816019.

It is an arithmetic number, because the mean of its divisors is an integer number (7307596365).

Almost surely, 2^121586490550 is an apocalyptic number.

121586490550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121586490550 is an abundant number, since it is smaller than the sum of its proper divisors (141486978590).

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

121586490550 is a wasteful number, since it uses less digits than its factorization.

121586490550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49627165 (or 49627153 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 121586490550 in words is "one hundred twenty-one billion, five hundred eighty-six million, four hundred ninety thousand, five hundred fifty".