21455425430320 has 80 divisors (see below), whose sum is σ = 57976403915520. Its totient is φ = 7231465412352.

The previous prime is 21455425430303. The next prime is 21455425430363. The reversal of 21455425430320 is 2303452455412.

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 (40).

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, 324655602 + ... + 324721681.

It is an arithmetic number, because the mean of its divisors is an integer number (724705048944).

Almost surely, 2^{21455425430320} is an apocalyptic number.

21455425430320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21455425430320 is an abundant number, since it is smaller than the sum of its proper divisors (36520978485200).

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

21455425430320 is a wasteful number, since it uses less digits than its factorization.

21455425430320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649377362 (or 649377356 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 40.

Adding to 21455425430320 its reverse (2303452455412), we get a palindrome (23758877885732).

The spelling of 21455425430320 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred twenty-five million, four hundred thirty thousand, three hundred twenty".