121252013500 has 48 divisors (see below), whose sum is σ = 265234761792. Its totient is φ = 48423816000.

The previous prime is 121252013489. The next prime is 121252013513. The reversal of 121252013500 is 5310252121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123342 + ... + 507658.

It is an arithmetic number, because the mean of its divisors is an integer number (5525724204).

Almost surely, 2^121252013500 is an apocalyptic number.

121252013500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121252013500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132617380896).

121252013500 is an abundant number, since it is smaller than the sum of its proper divisors (143982748292).

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

121252013500 is a wasteful number, since it uses less digits than its factorization.

121252013500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384967 (or 384955 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 121252013500 its reverse (5310252121), we get a palindrome (126562265621).

The spelling of 121252013500 in words is "one hundred twenty-one billion, two hundred fifty-two million, thirteen thousand, five hundred".