121056199000 has 128 divisors (see below), whose sum is σ = 322459937280. Its totient is φ = 42106416000.

The previous prime is 121056198961. The next prime is 121056199003. The reversal of 121056199000 is 991650121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121056199003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13759 + ... + 492241.

It is an arithmetic number, because the mean of its divisors is an integer number (2519218260).

Almost surely, 2^121056199000 is an apocalyptic number.

121056199000 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 121056199000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161229968640).

121056199000 is an abundant number, since it is smaller than the sum of its proper divisors (201403738280).

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

121056199000 is a wasteful number, since it uses less digits than its factorization.

121056199000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478538 (or 478524 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 34.

The spelling of 121056199000 in words is "one hundred twenty-one billion, fifty-six million, one hundred ninety-nine thousand".