121316657472 has 196 divisors, whose sum is σ = 361996878240. Its totient is φ = 40320675072.

The previous prime is 121316657471. The next prime is 121316657477. The reversal of 121316657472 is 274756613121.

121316657472 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 1 + 6 + 6 + 574 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121316657471) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 16745883 + ... + 16753125.

Almost surely, 2^121316657472 is an apocalyptic number.

121316657472 is a gapful number since it is divisible by the number (12) 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 121316657472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180998439120).

121316657472 is an abundant number, since it is smaller than the sum of its proper divisors (240680220768).

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

121316657472 is an frugal number, since it uses more digits than its factorization.

121316657472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7632 (or 7607 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The spelling of 121316657472 in words is "one hundred twenty-one billion, three hundred sixteen million, six hundred fifty-seven thousand, four hundred seventy-two".