121300512550 has 48 divisors (see below), whose sum is σ = 260260128000. Its totient is φ = 41200054560.

The previous prime is 121300512511. The next prime is 121300512559. The reversal of 121300512550 is 55215003121.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121300512559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1582050 + ... + 1656949.

It is an arithmetic number, because the mean of its divisors is an integer number (5422086000).

Almost surely, 2^121300512550 is an apocalyptic number.

121300512550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121300512550 is an abundant number, since it is smaller than the sum of its proper divisors (138959615450).

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

121300512550 is a wasteful number, since it uses less digits than its factorization.

121300512550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239125 (or 3239120 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 121300512550 its reverse (55215003121), we get a palindrome (176515515671).

The spelling of 121300512550 in words is "one hundred twenty-one billion, three hundred million, five hundred twelve thousand, five hundred fifty".