121012500 has 144 divisors (see below), whose sum is σ = 404224128. Its totient is φ = 27600000.

The previous prime is 121012487. The next prime is 121012517. The reversal of 121012500 is 5210121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 262270 + ... + 262730.

It is an arithmetic number, because the mean of its divisors is an integer number (2807112).

Almost surely, 2^121012500 is an apocalyptic number.

121012500 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 121012500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202112064).

121012500 is an abundant number, since it is smaller than the sum of its proper divisors (283211628).

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

121012500 is an equidigital number, since it uses as much as digits as its factorization.

121012500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 121012500 is about 11000.5681671448. The cubic root of 121012500 is about 494.6257757200.

Adding to 121012500 its reverse (5210121), we get a palindrome (126222621).

The spelling of 121012500 in words is "one hundred twenty-one million, twelve thousand, five hundred".