21231140104104 has 128 divisors (see below), whose sum is σ = 61289971142400. Its totient is φ = 6003091537920.

The previous prime is 21231140104093. The next prime is 21231140104117. The reversal of 21231140104104 is 40140104113212.

It is a happy number.

It is a super-2 number, since 2×21231140104104² (a number of 27 digits) contains 22 as substring.

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

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, 298653844 + ... + 298724924.

It is an arithmetic number, because the mean of its divisors is an integer number (478827899550).

Almost surely, 2^{21231140104104} is an apocalyptic number.

21231140104104 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 21231140104104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30644985571200).

21231140104104 is an abundant number, since it is smaller than the sum of its proper divisors (40058831038296).

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

21231140104104 is a wasteful number, since it uses less digits than its factorization.

21231140104104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89523 (or 89519 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 21231140104104 its reverse (40140104113212), we get a palindrome (61371244217316).

The spelling of 21231140104104 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred forty million, one hundred four thousand, one hundred four".