21322301220 has 192 divisors, whose sum is σ = 76175769600. Its totient is φ = 4896961920.

The previous prime is 21322301219. The next prime is 21322301233. The reversal of 21322301220 is 2210322312.

21322301220 is a `hidden beast` number, since 21 + 322 + 301 + 2 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21322301193 and 21322301202.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18397 + ... + 207323.

It is an arithmetic number, because the mean of its divisors is an integer number (396748800).

Almost surely, 2^21322301220 is an apocalyptic number.

21322301220 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 21322301220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38087884800).

21322301220 is an abundant number, since it is smaller than the sum of its proper divisors (54853468380).

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

21322301220 is a wasteful number, since it uses less digits than its factorization.

21322301220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188975 (or 188967 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21322301220 its reverse (2210322312), we get a palindrome (23532623532).

The spelling of 21322301220 in words is "twenty-one billion, three hundred twenty-two million, three hundred one thousand, two hundred twenty".