21330412042440 has 64 divisors (see below), whose sum is σ = 64624812759360. Its totient is φ = 5631791955200.

The previous prime is 21330412042421. The next prime is 21330412042477. The reversal of 21330412042440 is 4424021403312.

It is a super-2 number, since 2×21330412042440² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21330412042398 and 21330412042407.

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, 879955374 + ... + 879979613.

It is an arithmetic number, because the mean of its divisors is an integer number (1009762699365).

Almost surely, 2^{21330412042440} is an apocalyptic number.

21330412042440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330412042440 is an abundant number, since it is smaller than the sum of its proper divisors (43294400716920).

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

21330412042440 is a wasteful number, since it uses less digits than its factorization.

21330412042440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759935102 (or 1759935098 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21330412042440 its reverse (4424021403312), we get a palindrome (25754433445752).

The spelling of 21330412042440 in words is "twenty-one trillion, three hundred thirty billion, four hundred twelve million, forty-two thousand, four hundred forty".