121123021312 has 80 divisors (see below), whose sum is σ = 248136040152. Its totient is φ = 59031060480.

The previous prime is 121123021309. The next prime is 121123021373. The reversal of 121123021312 is 213120321121.

It can be written as a sum of positive squares in 4 ways, for example, as 14596505856 + 106526515456 = 120816^2 + 326384^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121123021312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33522418 + ... + 33526030.

Almost surely, 2^121123021312 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 121123021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124068020076).

121123021312 is an abundant number, since it is smaller than the sum of its proper divisors (127013018840).

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

121123021312 is an equidigital number, since it uses as much as digits as its factorization.

121123021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5269 (or 5253 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121123021312 its reverse (213120321121), we get a palindrome (334243342433).

The spelling of 121123021312 in words is "one hundred twenty-one billion, one hundred twenty-three million, twenty-one thousand, three hundred twelve".