121945587720 has 128 divisors (see below), whose sum is σ = 401543792640. Its totient is φ = 29381149440.

The previous prime is 121945587697. The next prime is 121945587761. The reversal of 121945587720 is 27785549121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68224 + ... + 498543.

It is an arithmetic number, because the mean of its divisors is an integer number (3137060880).

Almost surely, 2^121945587720 is an apocalyptic number.

121945587720 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 121945587720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200771896320).

121945587720 is an abundant number, since it is smaller than the sum of its proper divisors (279598204920).

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

121945587720 is a wasteful number, since it uses less digits than its factorization.

121945587720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566955 (or 566951 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 51.

The spelling of 121945587720 in words is "one hundred twenty-one billion, nine hundred forty-five million, five hundred eighty-seven thousand, seven hundred twenty".