21103115403504 has 80 divisors (see below), whose sum is σ = 55096135121664. Its totient is φ = 6959690112000.

The previous prime is 21103115403497. The next prime is 21103115403541. The reversal of 21103115403504 is 40530451130112.

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, 3437704 + ... + 7350104.

Almost surely, 2^{21103115403504} is an apocalyptic number.

21103115403504 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 21103115403504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27548067560832).

21103115403504 is an abundant number, since it is smaller than the sum of its proper divisors (33993019718160).

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

21103115403504 is a wasteful number, since it uses less digits than its factorization.

21103115403504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3913606 (or 3913600 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 21103115403504 its reverse (40530451130112), we get a palindrome (61633566533616).

The spelling of 21103115403504 in words is "twenty-one trillion, one hundred three billion, one hundred fifteen million, four hundred three thousand, five hundred four".