121897198080 has 1680 divisors, whose sum is σ = 538424181504. Its totient is φ = 26336378880.

The previous prime is 121897198067. The next prime is 121897198097. The reversal of 121897198080 is 80891798121.

It is a tau number, because it is divible by the number of its divisors (1680).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 2834818539 + ... + 2834818581.

Almost surely, 2^121897198080 is an apocalyptic number.

121897198080 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 121897198080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269212090752).

121897198080 is an abundant number, since it is smaller than the sum of its proper divisors (416526983424).

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

121897198080 is an frugal number, since it uses more digits than its factorization.

121897198080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 54.

The spelling of 121897198080 in words is "one hundred twenty-one billion, eight hundred ninety-seven million, one hundred ninety-eight thousand, eighty".