21321201230220 has 384 divisors, whose sum is σ = 67530669760512. Its totient is φ = 4997836800000.

The previous prime is 21321201230207. The next prime is 21321201230261. The reversal of 21321201230220 is 2203210212312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 196000845 + ... + 196109595.

It is an arithmetic number, because the mean of its divisors is an integer number (175861119168).

Almost surely, 2^{21321201230220} is an apocalyptic number.

21321201230220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21321201230220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33765334880256).

21321201230220 is an abundant number, since it is smaller than the sum of its proper divisors (46209468530292).

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

21321201230220 is a wasteful number, since it uses less digits than its factorization.

21321201230220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109001 (or 108999 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21321201230220 its reverse (2203210212312), we get a palindrome (23524411442532).

The spelling of 21321201230220 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred one million, two hundred thirty thousand, two hundred twenty".