21030231404 has 96 divisors (see below), whose sum is σ = 47205580800. Its totient is φ = 8142313536.

The previous prime is 21030231403. The next prime is 21030231437. The reversal of 21030231404 is 40413203012.

It is a super-2 number, since 2×21030231404² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21030231403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 825749 + ... + 850835.

It is an arithmetic number, because the mean of its divisors is an integer number (491724800).

Almost surely, 2^21030231404 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 21030231404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23602790400).

21030231404 is an abundant number, since it is smaller than the sum of its proper divisors (26175349396).

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

21030231404 is a wasteful number, since it uses less digits than its factorization.

21030231404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25172 (or 25156 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21030231404 its reverse (40413203012), we get a palindrome (61443434416).

The spelling of 21030231404 in words is "twenty-one billion, thirty million, two hundred thirty-one thousand, four hundred four".