121402120500 has 144 divisors (see below), whose sum is σ = 384801318720. Its totient is φ = 32220216000.

The previous prime is 121402120447. The next prime is 121402120549. The reversal of 121402120500 is 5021204121.

121402120500 is a `hidden beast` number, since 1 + 2 + 1 + 40 + 2 + 120 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 885571 + ... + 1013429.

It is an arithmetic number, because the mean of its divisors is an integer number (2672231380).

Almost surely, 2^121402120500 is an apocalyptic number.

121402120500 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 121402120500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192400659360).

121402120500 is an abundant number, since it is smaller than the sum of its proper divisors (263399198220).

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

121402120500 is a wasteful number, since it uses less digits than its factorization.

121402120500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128095 (or 128080 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 121402120500 its reverse (5021204121), we get a palindrome (126423324621).

The spelling of 121402120500 in words is "one hundred twenty-one billion, four hundred two million, one hundred twenty thousand, five hundred".