121403274816 has 112 divisors (see below), whose sum is σ = 328355553600. Its totient is φ = 39575027712.

The previous prime is 121403274791. The next prime is 121403274823. The reversal of 121403274816 is 618472304121.

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, 2158540 + ... + 2214068.

Almost surely, 2^121403274816 is an apocalyptic number.

121403274816 is a gapful number since it is divisible by the number (16) 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 121403274816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164177776800).

121403274816 is an abundant number, since it is smaller than the sum of its proper divisors (206952278784).

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

121403274816 is a wasteful number, since it uses less digits than its factorization.

121403274816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55796 (or 55786 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

Adding to 121403274816 its reverse (618472304121), we get a palindrome (739875578937).

The spelling of 121403274816 in words is "one hundred twenty-one billion, four hundred three million, two hundred seventy-four thousand, eight hundred sixteen".