121871238720 has 672 divisors, whose sum is σ = 493154500608. Its totient is φ = 24955392000.

The previous prime is 121871238719. The next prime is 121871238743. The reversal of 121871238720 is 27832178121.

It is a tau number, because it is divible by the number of its divisors (672).

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

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 57730465 + ... + 57732575.

It is an arithmetic number, because the mean of its divisors is an integer number (733860864).

Almost surely, 2^121871238720 is an apocalyptic number.

121871238720 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 121871238720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246577250304).

121871238720 is an abundant number, since it is smaller than the sum of its proper divisors (371283261888).

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

121871238720 is a wasteful number, since it uses less digits than its factorization.

121871238720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231 (or 2210 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 42.

The spelling of 121871238720 in words is "one hundred twenty-one billion, eight hundred seventy-one million, two hundred thirty-eight thousand, seven hundred twenty".