121956128700 has 144 divisors (see below), whose sum is σ = 408793002240. Its totient is φ = 27493793280.

The previous prime is 121956128683. The next prime is 121956128713. The reversal of 121956128700 is 7821659121.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 244470 + ... + 551069.

Almost surely, 2^121956128700 is an apocalyptic number.

121956128700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121956128700 is an abundant number, since it is smaller than the sum of its proper divisors (286836873540).

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

121956128700 is a wasteful number, since it uses less digits than its factorization.

121956128700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795636 (or 795629 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 42.

The spelling of 121956128700 in words is "one hundred twenty-one billion, nine hundred fifty-six million, one hundred twenty-eight thousand, seven hundred".