20123221404 has 288 divisors, whose sum is σ = 58925180160. Its totient is φ = 5283532800.

The previous prime is 20123221369. The next prime is 20123221451. The reversal of 20123221404 is 40412232102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 83498724 + ... + 83498964.

It is an arithmetic number, because the mean of its divisors is an integer number (204601320).

Almost surely, 2^20123221404 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 20123221404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29462590080).

20123221404 is an abundant number, since it is smaller than the sum of its proper divisors (38801958756).

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

20123221404 is a wasteful number, since it uses less digits than its factorization.

20123221404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20123221404 its reverse (40412232102), we get a palindrome (60535453506).

The spelling of 20123221404 in words is "twenty billion, one hundred twenty-three million, two hundred twenty-one thousand, four hundred four".