121255553530 has 16 divisors (see below), whose sum is σ = 219402722304. Its totient is φ = 48248282320.

The previous prime is 121255553513. The next prime is 121255553563. The reversal of 121255553530 is 35355552121.

It is a self number, because there is not a number n which added to its sum of digits gives 121255553530.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31740382 + ... + 31744201.

It is an arithmetic number, because the mean of its divisors is an integer number (13712670144).

Almost surely, 2^121255553530 is an apocalyptic number.

121255553530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121255553530 is a deficient number, since it is larger than the sum of its proper divisors (98147168774).

121255553530 is a wasteful number, since it uses less digits than its factorization.

121255553530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63484781.

The product of its (nonzero) digits is 112500, while the sum is 37.

It can be divided in two parts, 12125 and 5553530, that added together give a palindrome (5565655).

The spelling of 121255553530 in words is "one hundred twenty-one billion, two hundred fifty-five million, five hundred fifty-three thousand, five hundred thirty".