121798021392 has 240 divisors, whose sum is σ = 362216038912. Its totient is φ = 38138480640.

The previous prime is 121798021391. The next prime is 121798021393. The reversal of 121798021392 is 293120897121.

121798021392 is a `hidden beast` number, since 12 + 179 + 80 + 2 + 1 + 392 = 666.

It is an interprime number because it is at equal distance from previous prime (121798021391) and next prime (121798021393).

It is not an unprimeable number, because it can be changed into a prime (121798021391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129986748 + ... + 129987684.

Almost surely, 2^121798021392 is an apocalyptic number.

121798021392 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 121798021392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181108019456).

121798021392 is an abundant number, since it is smaller than the sum of its proper divisors (240418017520).

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

121798021392 is a wasteful number, since it uses less digits than its factorization.

121798021392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806 (or 1797 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 121798021392 in words is "one hundred twenty-one billion, seven hundred ninety-eight million, twenty-one thousand, three hundred ninety-two".