21431125104 has 80 divisors (see below), whose sum is σ = 58061760000. Its totient is φ = 6798705408.

The previous prime is 21431125099. The next prime is 21431125139. The reversal of 21431125104 is 40152113412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170922 + ... + 268470.

It is an arithmetic number, because the mean of its divisors is an integer number (725772000).

Almost surely, 2^21431125104 is an apocalyptic number.

21431125104 is a gapful number since it is divisible by the number (24) 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 21431125104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29030880000).

21431125104 is an abundant number, since it is smaller than the sum of its proper divisors (36630634896).

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

21431125104 is a wasteful number, since it uses less digits than its factorization.

21431125104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97782 (or 97776 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21431125104 its reverse (40152113412), we get a palindrome (61583238516).

The spelling of 21431125104 in words is "twenty-one billion, four hundred thirty-one million, one hundred twenty-five thousand, one hundred four".