21330440430040 has 64 divisors (see below), whose sum is σ = 57234473717760. Its totient is φ = 6995324561280.

The previous prime is 21330440430031. The next prime is 21330440430043. The reversal of 21330440430040 is 4003404403312.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 21330440429990 and 21330440430008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330440430043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1656083656 + ... + 1656096535.

It is an arithmetic number, because the mean of its divisors is an integer number (894288651840).

Almost surely, 2^{21330440430040} is an apocalyptic number.

21330440430040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330440430040 is an abundant number, since it is smaller than the sum of its proper divisors (35904033287720).

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

21330440430040 is a wasteful number, since it uses less digits than its factorization.

21330440430040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3312180232 (or 3312180228 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21330440430040 its reverse (4003404403312), we get a palindrome (25333844833352).

The spelling of 21330440430040 in words is "twenty-one trillion, three hundred thirty billion, four hundred forty million, four hundred thirty thousand, forty".