121386593550 has 24 divisors (see below), whose sum is σ = 301038752376. Its totient is φ = 32369758240.

The previous prime is 121386593521. The next prime is 121386593579. The reversal of 121386593550 is 55395683121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121386593521) and next prime (121386593579).

It is a self number, because there is not a number n which added to its sum of digits gives 121386593550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 404621829 + ... + 404622128.

It is an arithmetic number, because the mean of its divisors is an integer number (12543281349).

Almost surely, 2^121386593550 is an apocalyptic number.

121386593550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121386593550 is an abundant number, since it is smaller than the sum of its proper divisors (179652158826).

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

121386593550 is a wasteful number, since it uses less digits than its factorization.

121386593550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809243972 (or 809243967 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 121386593550 in words is "one hundred twenty-one billion, three hundred eighty-six million, five hundred ninety-three thousand, five hundred fifty".