20121321440000 has 180 divisors, whose sum is σ = 54751629526440. Its totient is φ = 7316843520000.

The previous prime is 20121321439927. The next prime is 20121321440039. The reversal of 20121321440000 is 4412312102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3956285 + ... + 7476284.

Almost surely, 2^{20121321440000} is an apocalyptic number.

20121321440000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121321440000 is an abundant number, since it is smaller than the sum of its proper divisors (34630308086440).

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

20121321440000 is an equidigital number, since it uses as much as digits as its factorization.

20121321440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11432616 (or 11432587 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20121321440000 its reverse (4412312102), we get a palindrome (20125733752102).

The spelling of 20121321440000 in words is "twenty trillion, one hundred twenty-one billion, three hundred twenty-one million, four hundred forty thousand".