21321333220 has 24 divisors (see below), whose sum is σ = 48845236608. Its totient is φ = 7753212000.

The previous prime is 21321333203. The next prime is 21321333259. The reversal of 21321333220 is 2233312312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21321333191 and 21321333200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48457356 + ... + 48457795.

It is an arithmetic number, because the mean of its divisors is an integer number (2035218192).

Almost surely, 2^21321333220 is an apocalyptic number.

21321333220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321333220 is an abundant number, since it is smaller than the sum of its proper divisors (27523903388).

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

21321333220 is a wasteful number, since it uses less digits than its factorization.

21321333220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96915171 (or 96915169 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21321333220 its reverse (2233312312), we get a palindrome (23554645532).

The spelling of 21321333220 in words is "twenty-one billion, three hundred twenty-one million, three hundred thirty-three thousand, two hundred twenty".