121236421900 has 108 divisors (see below), whose sum is σ = 296228149560. Its totient is φ = 43010528000.

The previous prime is 121236421897. The next prime is 121236421921. The reversal of 121236421900 is 9124632121.

It is a super-2 number, since 2×121236421900² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 373911 + ... + 618289.

Almost surely, 2^121236421900 is an apocalyptic number.

121236421900 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 121236421900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148114074780).

121236421900 is an abundant number, since it is smaller than the sum of its proper divisors (174991727660).

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

121236421900 is a wasteful number, since it uses less digits than its factorization.

121236421900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244456 (or 244438 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 121236421900 in words is "one hundred twenty-one billion, two hundred thirty-six million, four hundred twenty-one thousand, nine hundred".