121323144520 has 64 divisors (see below), whose sum is σ = 289548846720. Its totient is φ = 45593324544.

The previous prime is 121323144517. The next prime is 121323144533. The reversal of 121323144520 is 25441323121.

121323144520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224389 + ... + 541291.

It is an arithmetic number, because the mean of its divisors is an integer number (4524200730).

Almost surely, 2^121323144520 is an apocalyptic number.

121323144520 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 121323144520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144774423360).

121323144520 is an abundant number, since it is smaller than the sum of its proper divisors (168225702200).

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

121323144520 is a wasteful number, since it uses less digits than its factorization.

121323144520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317494 (or 317490 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 121323144520 its reverse (25441323121), we get a palindrome (146764467641).

The spelling of 121323144520 in words is "one hundred twenty-one billion, three hundred twenty-three million, one hundred forty-four thousand, five hundred twenty".