21103121440320 has 112 divisors (see below), whose sum is σ = 67008163712640. Its totient is φ = 5627015847936.

The previous prime is 21103121440307. The next prime is 21103121440343. The reversal of 21103121440320 is 2304412130112.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10312344 + ... + 12188136.

Almost surely, 2^{21103121440320} is an apocalyptic number.

21103121440320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103121440320 is an abundant number, since it is smaller than the sum of its proper divisors (45905042272320).

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

21103121440320 is a wasteful number, since it uses less digits than its factorization.

21103121440320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887532 (or 1887522 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21103121440320 its reverse (2304412130112), we get a palindrome (23407533570432).

The spelling of 21103121440320 in words is "twenty-one trillion, one hundred three billion, one hundred twenty-one million, four hundred forty thousand, three hundred twenty".