21213420422320 has 80 divisors (see below), whose sum is σ = 56619856097280. Its totient is φ = 7240557549312.

The previous prime is 21213420422287. The next prime is 21213420422323. The reversal of 21213420422320 is 2322402431212.

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 (28).

It is not an unprimeable number, because it can be changed into a prime (21213420422323) 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, 84810340 + ... + 85060099.

It is an arithmetic number, because the mean of its divisors is an integer number (707748201216).

Almost surely, 2^{21213420422320} is an apocalyptic number.

21213420422320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213420422320 is an abundant number, since it is smaller than the sum of its proper divisors (35406435674960).

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

21213420422320 is a wasteful number, since it uses less digits than its factorization.

21213420422320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169870682 (or 169870676 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21213420422320 its reverse (2322402431212), we get a palindrome (23535822853532).

The spelling of 21213420422320 in words is "twenty-one trillion, two hundred thirteen billion, four hundred twenty million, four hundred twenty-two thousand, three hundred twenty".