121219973400 has 144 divisors (see below), whose sum is σ = 396601569000. Its totient is φ = 30623938560.

The previous prime is 121219973293. The next prime is 121219973401. The reversal of 121219973400 is 4379912121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121219973401) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 63225 + ... + 496424.

Almost surely, 2^121219973400 is an apocalyptic number.

121219973400 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 121219973400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198300784500).

121219973400 is an abundant number, since it is smaller than the sum of its proper divisors (275381595600).

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

121219973400 is a wasteful number, since it uses less digits than its factorization.

121219973400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559706 (or 559678 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The spelling of 121219973400 in words is "one hundred twenty-one billion, two hundred nineteen million, nine hundred seventy-three thousand, four hundred".