21104002431240 has 128 divisors (see below), whose sum is σ = 67045029384960. Its totient is φ = 5295996575744.

The previous prime is 21104002431229. The next prime is 21104002431283. The reversal of 21104002431240 is 4213420040112.

It is a super-3 number, since 3×21104002431240³ (a number of 41 digits) contains 333 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21104002431240.

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, 14978797 + ... + 16327043.

It is an arithmetic number, because the mean of its divisors is an integer number (523789292070).

Almost surely, 2^{21104002431240} is an apocalyptic number.

21104002431240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104002431240 is an abundant number, since it is smaller than the sum of its proper divisors (45941026953720).

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

21104002431240 is a wasteful number, since it uses less digits than its factorization.

21104002431240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355951 (or 1355947 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21104002431240 its reverse (4213420040112), we get a palindrome (25317422471352).

The spelling of 21104002431240 in words is "twenty-one trillion, one hundred four billion, two million, four hundred thirty-one thousand, two hundred forty".