121313252550 has 96 divisors (see below), whose sum is σ = 343943914752. Its totient is φ = 27720074880.

The previous prime is 121313252549. The next prime is 121313252561. The reversal of 121313252550 is 55252313121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3708064 + ... + 3740636.

It is an arithmetic number, because the mean of its divisors is an integer number (3582749112).

Almost surely, 2^121313252550 is an apocalyptic number.

121313252550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121313252550 is an abundant number, since it is smaller than the sum of its proper divisors (222630662202).

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

121313252550 is a wasteful number, since it uses less digits than its factorization.

121313252550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36142 (or 36137 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 121313252550 its reverse (55252313121), we get a palindrome (176565565671).

The spelling of 121313252550 in words is "one hundred twenty-one billion, three hundred thirteen million, two hundred fifty-two thousand, five hundred fifty".