121437869808 has 320 divisors, whose sum is σ = 351291801600. Its totient is φ = 35988986880.

The previous prime is 121437869807. The next prime is 121437869849. The reversal of 121437869808 is 808968734121.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121437869803) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 262284585 + ... + 262285047.

It is an arithmetic number, because the mean of its divisors is an integer number (1097786880).

Almost surely, 2^121437869808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121437869808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175645900800).

121437869808 is an abundant number, since it is smaller than the sum of its proper divisors (229853931792).

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

121437869808 is a wasteful number, since it uses less digits than its factorization.

121437869808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 774 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 57.

The spelling of 121437869808 in words is "one hundred twenty-one billion, four hundred thirty-seven million, eight hundred sixty-nine thousand, eight hundred eight".