121351531050 has 120 divisors (see below), whose sum is σ = 337739799936. Its totient is φ = 32306441760.

The previous prime is 121351530953. The next prime is 121351531051. The reversal of 121351531050 is 50135153121.

121351531050 is a `hidden beast` number, since 121 + 3 + 5 + 1 + 531 + 0 + 5 + 0 = 666.

It is a super-2 number, since 2×121351531050² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (121351531051) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2433669 + ... + 2483031.

Almost surely, 2^121351531050 is an apocalyptic number.

121351531050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121351531050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168869899968).

121351531050 is an abundant number, since it is smaller than the sum of its proper divisors (216388268886).

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

121351531050 is a wasteful number, since it uses less digits than its factorization.

121351531050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49994 (or 49980 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

Adding to 121351531050 its reverse (50135153121), we get a palindrome (171486684171).

The spelling of 121351531050 in words is "one hundred twenty-one billion, three hundred fifty-one million, five hundred thirty-one thousand, fifty".