21104431000 has 128 divisors (see below), whose sum is σ = 51344280000. Its totient is φ = 8109696000.

The previous prime is 21104430953. The next prime is 21104431043. The reversal of 21104431000 is 13440112.

It is a super-2 number, since 2×21104431000² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6117276 + ... + 6120724.

Almost surely, 2^21104431000 is an apocalyptic number.

21104431000 is a gapful number since it is divisible by the number (20) 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 21104431000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25672140000).

21104431000 is an abundant number, since it is smaller than the sum of its proper divisors (30239849000).

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

21104431000 is a wasteful number, since it uses less digits than its factorization.

21104431000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710 (or 3696 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21104431000 its reverse (13440112), we get a palindrome (21117871112).

The spelling of 21104431000 in words is "twenty-one billion, one hundred four million, four hundred thirty-one thousand".