21330223515440 has 80 divisors (see below), whose sum is σ = 60011418791232. Its totient is φ = 6883030106112.

The previous prime is 21330223515439. The next prime is 21330223515443. The reversal of 21330223515440 is 4451532203312.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 21330223515440.

It is not an unprimeable number, because it can be changed into a prime (21330223515443) 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, 1120275329 + ... + 1120294368.

Almost surely, 2^{21330223515440} is an apocalyptic number.

21330223515440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330223515440 is an abundant number, since it is smaller than the sum of its proper divisors (38681195275792).

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

21330223515440 is a wasteful number, since it uses less digits than its factorization.

21330223515440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240569734 (or 2240569728 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 21330223515440 its reverse (4451532203312), we get a palindrome (25781755718752).

The spelling of 21330223515440 in words is "twenty-one trillion, three hundred thirty billion, two hundred twenty-three million, five hundred fifteen thousand, four hundred forty".